[SuperSajuuk]

Yeah I think this has happened before from time to time, they just air the episode as provided and don't go to the effort of editing out references to disgraced individuals, only because the time spent editing out such stuff would be more than the time spent just broadcasting it (and probably because editing it out draws more attention to the fact something had been excised).

The alternative could be to just put up a caption before the episode airs with something like "This episode references individuals who were famous at the time but have since been found guilty in court, or have passed away. These references remain to represent the culture at the time of original broadcast": iirc, I think WB did something like that with their really old cartoons that contained discriminatory language [but which was considered acceptable at the time the cartoon was made], but I don't see Challenge having the budget for such things, nor the audience / market that would really care about a passing reference in a quiz show question to a disgraced individual.

Worth pointing out that, in the Crystal Maze S1-S4 re-airing recently, a couple of incidents of contestants audibly swearing are left in as is, only because its the most minor of swears (the word being the slang for excrement, you can use your own mind to work it out) and doesn't really offend anyone.