I wouldn't think that copying pixel art from Wing Commander would help you become a better pixel artist. Instead, copying the attitude the original artist took toward creating the pixel art in the first place would help you more.
What I mean is, this guy looks like he was a painter before he was a pixel artist. Therefore, the attitude he took toward pixel art was that of a painter. As a beginner, you may not understand how I can arrive at this conclusion, but as an artist experienced with pixel techniques as well as painterly techniques, it is clear from his color choices to establish his gradients that he approached them from an approach to painting that resembled older 80s box-art which would have fit with the look of sci fi popular at the time.
That being said, because he was a painter before he was a pixel artist, he already understood the fundamentals required to create convincing enough pixel art. He clearly had much more to learn as a pixel artist in terms of technique, but to begin pixel art with fundamentals such as how to compose and light a scene, or how to draw human anatomy and facial forms, alongside a visual library of sci-fi he likely had from prior work to draw from, his transition to being able to create pixel art easily, even as a painter, probably came a lot more naturally to him than it would to someone who had no experience with those concepts.
So, to answer your question about whether *anyone* can be a pixel artist, the answer is yes -- just as long as they have the skills or approach to how and what type of pixel art they desire to create *prior* to attempting pixel art.
Pixel art both is and isn't a style -- but if you're approaching it to emulate a particular style, you best understand where that style came from, and embrace yourself all the attitudes and ideals it embraces, before trying to make it your own. If not, you'll struggle for years never understanding just why exactly your art never looks quite right.
The bottom line is, you'll be doing it wrong because you've practiced it wrong, and you practiced it wrong because you didn't understand how to practice, and you didn't understand how to practice because you didn't understand what was important to the look you were trying to achieve, and you didn't understand that because you haven't yet learned how to see art beyond the final image presented.
Once you have achieved a level of experience that you can glance at an image and break down a piece of art into its individual attitudes and techniques, you'll be able to create any art style you wish -- very well -- pixel art or otherwise.
Don't let this discourage you though -- you don't have to be a master at technique to create great art, just as long as you aim at and embrace practicing only the level of art that matches your own skill level.
Only when you feel bored with your level of skill, try learning a new technique or two, such as creating better 3d forms in grayscale or applying contrast and color to them, then try to do this on an image with multiple layers of depth, then finally practice using color and hue to separate elements where depth is a lot lower between the multiple planes of depth and later try doing this with textures. By the end of that, all that will be left is construction and color to learn if you wanted to take it to the limit. Both are choices made in the name of style -- you don't have to know them if you want unrealistic, but drawing from reality, even in cartoons, makes them more potent and relatable. The last thing you might want to know is composition, because through this, you learn unity and balance to create harmony in your images. These things take time, but learning them one at a time and never going beyond your skill until you're ready to learn a new technique is the key to becoming a skilled artist and making great art in the process of getting there.
One thing you probably never consider as a new artist is that you can already make great art -- especially when looking at what you want to do, versus what you can already do.. But this is a fallacy in your mindset. No matter how simple or untrained the artist's hand, your unique touch is always present in every stroke or simple shape you make. Whether it is hastily drawn, or carefully crafted, with or without technical skill, you're very life is present in your art. So, my advice is to embrace your own essence in your art, rather than trying to emulate a look or a style, because you'll find one a lot faster, one of your own, with all the greatness of your influences, when you embrace only what you are currently capable, and embrace more only when you are capable of more. You will look to your influences to understand them gradually, and will be as good (or better!) than them before you ever realize it! Your goal should only ever be to be as good as you are right now, and only move beyond that when you're fully comfortable with where you are now. If you keep practicing at that, even at one hour a day, you'll be better than you've ever imagined you're capable of -- and gotten there tons faster than you would have had you been trying to be as 'good' as someone else.
