There is no legitimate allegation if it is simply posted to twitter or instagram. Am I missing something? Has this person come forward (I don't mean publicly, but at least to law enforcement or a journalist).
As for multiple accusers, they could all be from the same person, creating multiple fake accounts. It could even be a man, or someone who doesn't like him but never met him.
So FP disappears for three days, then comes back, then public allegations are made on Twitter and in The Athletic, and FP disappears again.
MASN says FP's second disappearance is so that a panel of former MLB players can look into the allegations. WaPo says that the first disappearance was also about sexual allegations and that he had been cleared to come back.
I infer from this that there must be at least two accusers: that is why he got suspended twice. The one that went public recently must be the second accuser.