I think there's some truth to what he says here. For some topics he actually just does let people talk. And that's fine. But there are some topics where Joe isn't just "asking questions" but is actively pushing a particular viewpoint.
The first and most obvious one is vaccines. Covid has broken this man's brain. If you go back to March 2020, his interview with Michael Osterholm [1] was actually really good. It was one of the first I saw that recognized how serious this actually was. But for whatever reasons, Joe has decided vaccines are bad and he's had a parade of grifters and charlatans on to back up that view (eg Robert Malone). There is absolutely no evidence in the world that will change his mind.
The second is all his manosphere [2] content. He really rode the wave of popularity of Jordan Peterson in particular and really gave him a platform with no pushback whatsoever. The recent rise of Andrew Tate is just the latest manifestation of this (fun fact: Tate dated JP's daughter a couple of years ago).
The third is transgender people. Trans people broke a lot of people in a way that's reminiscent of 1990s era homophobia. Bill Maher is another example of this.
So a big part of Joe's popularity isn't just a "dumb guy asking questions", it's that he pushes very normative and popular opinions.