From the Kotaku article:
The fact is the rooms look like any standard hotel room. It's all bullshit.By 2013 there were already multiple allegations of sexual assault against Cosby, even if a conviction, which was later overturned on a technicality, wouldn’t come until 2018. According to one source with knowledge of the hotel room, the “Cosby Suite” name was a play on the comedian’s iconic ugly sweaters, and didn’t have any sexual connotation—at least, not when the joke began. Instead, they suggest, the running joke was that the rooms in question looked dated, like the sweater.