This area has several facets to it. Is it okay to leave the ones that say he was as reverse time dependent ones (meaning at the time of the Q writing, the fact was true)? Will all the Qs about bicycling need to be reviewed for mention that he was the champ? Can some be let slide if the mention is only in the Info? Is possibly his first Yellow Shirt to be considered legit but he's losing it because of subsequent cheating?
In any case, a lot of work is going to be needed to be done by the Sports and possibly General (because of his foundation having Qs that reference his wins) Editors revising Single Qs and whole Quizzes that he is part of.
"...Tomorrow's come a long way to help you."
Tim Davis 'Your Saving Grace' Steve Miller Band (1969)
"...Yesterday's at least a mile back."
Dale Peters 'Dreaming in the Country' James Gang (1971)