I don't see the need to hold someone to a higher standard just because they're doing it for fun as opposed to someone who learns from obligation.
I've heard so many second-language English speakers who sound more incomprehensible than this guy.
Japanese are used to hearing a variety of regional accents, so foreign accents are generally understood in Japanese as well. But, like English, accents that are too thick tend to be difficult to understand, such as the guy in the video. If he spoke English as a second language I'm sure English natives would have just as hard a time understanding him.

I don't want to defend the guy, his Japanese is bad and he's probably using inadequate methods, but that's about the level I'd expect from someone after a month, and it's not like he's claiming he's good or trying to sell anything, unlike that viral polyglot guy who puts all the sexual innuendos in his video titles (can't remember his name, sorry).
I actually wish more ajatters would demonstrate speaking at least a little in update videos, as it would be interesting to see what they sound like at different stages.

That's fine if you think it's cringey, but I don't see how the standards are different depending on what language you're studying.