[Lazare]

Coincidentally, I just ran across someone else trying (and failing) to get Google to update a similar incorrect line in their knowledge graph. In this case, the person is fairly well known on YouTube, and their profession line should almost certainly read "Canadian YouTuber" (as the profession line for all of her peers does), but instead it reads "Actress", which is pretty odd and inaccurate. (You could make an argument that someone who posts content on YouTube is technically an actor/actress, but that's a very uncommon usage, and as with OP, misleads much more that it conveys useful information. And again, Google, who owns YouTube, clearly prefers to label prominent YouTubers as <nationality> YouTuber.)

In her case she apparently got a response saying "our systems don't allow us to fix this type of error", she escalated, then she got a response saying "good news, it's fixed!", but it's not fixed.

If Google is just summarising info from other sources (and in many cases, they just repeat what Wikipedia has), that's fine, but in cases (as here) where they're acting as an independent source of truth, they really need some process for fixing mistakes...