That was in the same email conversation where Epstein mentioned the helicopter.

"Epstein’s pilots kept standard FAA flight logs, listing takeoff/landing airports and crew, not details about passengers. Logs introduced in court only show names when required and are not full passenger manifests".

So it's entirely possible he did visit the island, just that there's no evidence recorded in a log of who went via helicopter (or, at least, none made public), unlike that for the 'Lolita Express', for example.

As least, that's what I believe.