I don't know, between the people pushing these allegations (e.g. Ralph), how long ago this incident supposedly took place and just all the he-said-she-said, I see no benefit for Ashton or Andy to address any of it for the sake of their show or their reputations, true or not. The people pressing them to address it don't even watch the casino in the first place, and it seems to me at the core of it what Ralph and co. want is their attention. By just acknowledging the allegations–they don't even have to name anyone involved–they would be giving them that attention they so desire, and their audience would be asking them a bunch of questions they otherwise wouldn't.