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I would solve it in a very simple way, anyone who appears on the forum claiming to be Satoshi would be given 24 hours to prove it or be permanently banned - such members have zero value for the forum.
Anyone claiming to be satoshi then he doesn't need to publish "I am Satoshi Nakamoto" but prove he has knowledge like satoshi and can do something about satoshi addresses to prove it, maybe even more than 100 people claiming to be fake satoshi don't have anything to do with with satoshi and just bullshit claims, I support your statement above that anyone claiming to be satoshi has to prove 24 hours on this forum and if he can't prove then he has to claim himself that he's out of the trash.