Thomas has said before that he doesn’t have a secret fan account. Whether or not you believe that is up to you. Personally, though–and I’m not a conspiracy theorist in any sense–I feel like you kids are missing something. Sure, Thomas is the one who makes the references, since he does play all the characters.
However, he is not the only scriptwriter of the series.
So I hear your “What if Thomas has a secret account” and raise you a “What if Joan has a secret account so they can gush even more about their best friend?”