What makes you think that if he reveals himself here in the forum, then he is the real Satoshi? I'm very sure that in the past many people in the forum might have come out to claim to be Satoshi. The only way we can confirm here if Satoshi reveals himself is to make a post if he already have a personal account here in the forum that is verified to be his.
But I don't know why people are always talking about Satoshi revealing himself; I think this is something that is impossible and there is no need for him to reveal himself.
You just ask a question and went ahead to actually answer yourself, I clearly said that if it was this forum it might be understandable and that clearly means if the revelation was actually from his personal account, I will be stupid to believe another account parading itself as Satoshi, reason why I think it would be understandable if it is from this forum is simply because it is the only account I trust his information can be verified from and that if it falls into wrong hands the forum administrator wouldn’t allow hackers to get access to it.
Another possible way where many people will believe it is from him is signing a message from that his dormant addresses saying he published so and so information and that’s his/her identity. It is even the most believable thing because we all know only Satoshi has access to the private keys to those addresses