Darien, true but then it is culturally relevant as retrogame art, not as pixel art per se. Hence the point of the documentary could just as well have been 'retro-looking computer art' which includes some pixel art and pixel art theory and concepts but not all of it.
This is the problem on coming to pixel art from an indie game angle too hard, as it could be about coming to it from a demoscene angle too hard or any other angle. If one is making a documentary about the demoscene he'd have to talk about pixel art briefly. If they were making a documentary about the NES, they'd have to talk about pixel art briefly. But only if they were making a documentary about pixel art would they have to talk about all the aspects of it fully.
It is in this way that the documentary is unsatisfactory. Not in that it doesn't show 'kewl pixel art from my buddies at pixeljoint' but in that it seems slightly uninformed about the history and various strands of the artform through 30 years of evolution. 30 years are a long time and even a primer documentary about a subject should have at least a cursory knowledge of the timeline. If the person making this documentary doesn't have a bell ringing in their brain when I mention every one of the below terms, they're not yet equipped to make documentaries on the subject

1. Spacewar!
2. coin-op
3. Macintosh & the concept of '1bit'
4. dithering/stippling
5. sprite
6. demoscene
7. deluxe paint
8. indexed palette
9. 16-bit game consoles
and
then stuff like indie game scene, retro-revival, pixelly music video, pixelation/pixeljoint and the like.
EDIT: wait, I didn't mean for my reply to sound damning for the project. It's well-done, good editing, good visual examples, interesting interviews, great music! It just leaves a lot to be desired as a public record of something that has a lot of facets and depth to it.