AFAIK, with any truly elite athlete the answer to the question 'are they using PEDs' is 'probably, but not definitely'- pending a failed drugs test. You can qualify it slightly (in bigger and more competitive sports it might be a bit more likely) but that is basically it. Really not that much point asking or arguing.
It also seems that any competitive athlete using PEDs will also deny using PEDs. And that makes sense given that they can't really say "no comment", and "yes" even less. Then it would make sense that people would come back to them saying "You said you are drug free... really? Really? Can you say that again please?" and it becomes a thing. As long as they are not trashing their competitors, saying "I am drug free and they are all cheating bastards", it doesn't seem worth getting into.
tl;dr asking the question about any individual athlete is a complete waste of time, even if they periodically deny using.