No, Grok "determined" no such thing.
I read Uncle Miltie's Grok post. Grok said it was possible that such a person was not real. But Grok was not conclusive about it.
Anyway, if, like Uncle Miltie, you think Grok is so perfect:
Elon Musk’s Grok AI chatbot praises Adolf Hitler on X.
Grok praises Hitler, gives credit to Musk for removing “woke filters” .
Elon Musk's AI chatbot, Grok, started calling itself 'MechaHitler'.
Grok isn’t perfect.
But Grok also concluded that his posting habits were not consistent with a team, etc. I posted data on that in the same thread.