Googling it isn't due diligence, and you haven't presented any facts lol. "Nobody knows the timeline" means your guess on when he returns is completely baseless whether it turns out to be right or not.
I could guess right now that Patrick Mahomes will be traded before the deadline, and it would come from nowhere. It doesn't become a smarter prediction if it actually does happen, because there's nothing to support that. This is basically what is going on with anyone who guesses when TFred will be back.