As someone that only speaks english myself: I genuinely don’t mean this as an insult, you’re coming across as somewhat demanding and slightly childish yourself, because of your tone and the heavy (and misplaced/undeserved) condescension.
While this site started out exclusively English, and is still primarily english, at some point (7+ years ago) they started making a more global push and expanded the language offerings.
This person might be interacting with the site through their native language, and using this as a free platform to publish things online, sharing it elsewhere. If you check their profile, all their previous uploads actually were in English, and got zero engagement. The first comment they’ve gotten, after years here, looks like this one you? So I can’t really fault them for not trying to appeal to their non-existent english audience.
The real issue here isn’t this person for publishing this, it’s that itch doesn’t offer “supported languages” tags for games so that people could filter their searches to just their known languages.
anyway, please be nicer thanks :)