It's an interesting turn of phrase, because there's a very real pipeline in which people with less-trained critical thinking skills listen to Rogan -> cannot distinguish openness from endorsement -> believe Rogan is endorsing anti-vaxx voices -> contribute to an aggregate increase in community transmissibility of communicable diseases with proven neurological impacts -> said diseases turn immunocompromised people's neurons to "mush" at an increased rate, through no fault or Rogan-listening of the victims' own.
Rogan has consistently made a decision to prioritize the "vibe" of his podcast over pushing his interview subjects in a way that would make it clear that his provision of a platform is not endorsement. Sure, he challenges things as you have mentioned, but when he challenges anti-vaxx voices no more or no less than he would a guest who, say, had an opinion about hunting he didn't like, that creates a responsibility that I think does scale with audience size.
https://www.npr.org/2022/01/21/1074442185/joe-rogan-doctor-c...