You cannot actually know that. All you can allege is that Trump isn't recorded as flying on the Lolita Express... but presuming that Trump is incapable of flying there on another plane (or arriving by boat) is a bit silly.
I know that we all hope that he isn't involved in it... and his banning of Epstein is very strong circumstantial evidence against the notion... but you cannot make the blanket statement with any sort of authority.
And as a possible rebuttal to the Epstein banning... Epstein supposedly made his money through the blackmailing of the elites... maybe playboy Trump did have a tryst with one of Epstein's underage victims, and Epstein tried to bribe Trump... and that's what brought on the ban. (Some folks do not surrender to blackmail.) If this wild and unfounded speculation of mine is correct, then Epstein could show the Trump tapes, or make the claim publicly... but maybe he never had any, and the blackmail was a bluff based just on the knowledge of the event.
In short, we know nothing. It's all guesswork until something substantive appears.
All I said is that Trump was never on Pedophile Island, but somehow your busy little neurons painted a picture of something very different.
Trump said he was never there, and I believe him.
Why? Because, in forty years, I've never known him to lie about any matter where deeper fact checking could reveal him to be untruthful - have you?
In fact, I challenge anyone to come up with proof positive that Trump has ever blatantly lied to anyone, about anything. The man has a long history of being an honest, straight shooter. That quality was essential to his business success.
He may have some less than admirable personality quirks, but lying (ala Clintons, et al) isn't one of them.
I'm actually wondering why you would even suspect Trump of being untruthful about this.