what's going on here?

This is so weird. The domain has whois information withheld and the site is hosted on Vercel.

Best hint is the submission history of https://news.ycombinator.com/submitted?id=zoudong376 which shows similar unofficial sites for other projects.

so there's like a little network of chinese fake AI product shipping or something?

Someone farming fake internet points and real internet traffic.

Is the information in the video accurate? (specifically wondering about the multi-keyframe function)

Yeah, but the webpage itself is unauthorized, even though it links to the official sources.

Best case, an overenthusiastic fan, worst case, some bad actor trying to establish a "sleeper page".