I think this is something we'll start to see which is something like a Mandela-Effect, but from LLM results. When we had deterministic search - everyone could see the same result, but now using LLMs knowledge becomes a training and seeding issue. Two people can confidently be given completely different information, so in both cases perceived as true.
Gemini answers with 3 different champions dating back to 2024 and the list of events that the matches were played at. None of the results mention this guy.
Asking Opus 4.7 who the reigning 6nimmt! champion is leads to this article and a warning about a possible hoax