The joke was at the beginning--within the first 5 minutes--of season 5, episode 20, which first aired 18 December 1993.
The joke doesn't make any sense--to me, at least--but given that the MST3K reboot during the covid era--produced by Joel himself--was a gay woke-fest, you have to wonder. Maybe Joel knew something we didn't at the time.
Edit: It is a Mike Nelson episode. Immediately after the Epstein reference, Mike is ripping up a pair kid's underwear (briefs).
Not exactly Epstein... BUT.. There is a Hong Kong movie called "The Tricky Master" which was from year 2000.
"Yes, this cheater makes money faster than Soros. This cheater lies better than Clinton. Recently he helped the foreigners to crush the stock market".