I did some very quick testing of that and yeah, not working for me either. Decided to check out some older videos on the site and even bigger videos that are a month old like this video from @Rerez or this random one that go no attention from 2 weeks ago also had this issue. Got it on other videos over a week old as well, but sometimes it worked.

I might contact support about that later, because videos that are just a week old no longer being accessible seems odd especially when the homepage of IPFS states a benefit of it is that it archives it permanently.

That said though, on slightly closer inspection I think IPFS is basically using a bunch of smaller servers instead of one centralised server so it could be just a dodgy server hosting certain ones or something. I don't know, still haven't bothered to read the whitepaper on it yet. Could also be the same thing constantly turning night mode off and putting back on the NSFW filter.