Hmmm. So basically it boils down to "we the press are pissed off that the Gates' won't spill the beans on their divorce, there is no sign of any juicy headlines or acrimonious fights, so we will dredge up some anonymous source to suggest something not in evidence in order to sell some news space".
There is no actual evidence that Melinda has anything to do with this non-story, but in all honesty, if she does, then I would say that it says something about her if she hung around for seven or so years with a man that it is being suggested was possibly a participant in Epstein's crimes. Without saying so directly of course, because Bill Gates could bring them all crashing to their knees if he had a mind to.