As others mentioned people already knew Trump was involved with Epstein, but I think a lot of people overestimate this fact considering he was only listed there once. I never believed he was truly a pedo or trafficker in this one instance because of this weird incident that followed it, which some people might be familiar with I just can't find it anymore. He made this post after the fact essentially saying 'Just met with Epstein, really great guy. Really likes the ladies too. Some says he likes them YOUNG, like really YOUNG.' I honestly believe he was whistleblowing back then, but maybe people would find that idea too optimistic.
Ultimately I have doubts that Elon even laid eyes on the Epstein files at all. I knew it was going to bite Trump eventually to be involved with him because he's so petty and attention seeking in everything he does, and I 100% thought that when they did eventually fight that Musk would do something petty on the way out. Ultimately this feels kind of weak to me, like I legit thought Musk might release docs or do some worse shit once he pissed Trump off. The actual best possible outcome would be Trump calling his bluff and actually releasing the unredacted Epstein files, but I'm not gonna hold my breath.