For one, Joe Rogan is not transphobic. If they perpetuate that misinformation, you should be skeptical of the rest.
I'm not going to spend time on the rest of the falsehoods.
Joe is not always right in every moment with every statement, but he does correct himself when new information is presented to him. He talks a lot about this. He wouldn't have the number one podcast if he wasn't genuine and a good person.
I recommend listening to several whole episodes on topics of interest to you, rather than taking what a sound bite oriented, context avoiding, secondary source is saying.
What makes you say this? Isn't he one of the biggest culture warriors who demonizes trans people, i.e. claiming they are a big problem when they really aren't? He takes sides firmly against trans people participating in society like cis people do. You can't really get more transphobic than that.
Nobody would really care about being around trans people if influencers like Joe Rogan didn't say they were an inherent problem that need to be dealt with. He cites the accomplishments of trans people in sports as if that is a problem in and of itself... trans people succeeding. Like just the thought of a trans person doing well is enough to set Joe Rogan off and stir up his millions of followers into an anti-trans rage.