Trump has directed Pam Bondi to investigate the Democrats who might have been involved with Epstein. This strongly smacks of corruption as the DOJ is supposed to be independent from the Executive. It is not POTUS that determines who will be investigated, that's up to the DOJ. It appears Trump is once again, trying to run some misdirection as he isn't interested in what Republicans might have been involved with Epstein, only the Democrats.
Biden never released info because at that time the case was under investigation and cases under investigation are not talked about while evidence is gathered to prevent spoilage of the evidence as well as prevention of witness tampering.
Trump has continually blamed Biden for anything and everything, so he could see himself as blameless.
This also could set up blockage of the Epstein release of files from the DOJ while they too claim the investigation is ongoing, even though Republicans are supposedly left out of the investigation. Again, it looks like Trump is either trying to shield himself or he is trying to shield his mega-donors and the wealthy who might have been involved. Either way, it sets up a clear case of cover-up, where the more Trump is involved and comments, the more it looks like he has something serious he's afraid will come out and and is trying to hide that info from being released. The more he tries to misdirect the more he digs himself a hole in involvement.
Trump claimed he parted with Epstein and he hadn't spoken to Epstein in 15 years, which would have been 2004. Yet the release of some of Epstein's emails showed that Epstein had attended Thanksgiving Dinner at Mar-a-largo in 2014. There's a lot that's off in what Trump claims and what appears to be facts.
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It is very likely, those files have already been scrubbed to remove Trump and the Republicans.