Joe Rogan does not identify with the Republican party, I believe he voted Democrat in the last election.
Joe Rogan repeating outright lies about Biden being senile and incapable of communication in order to justify voting for a man he himself has called dangerous and a moron. What do you call a person who proclaims he's voting for a dangerous moron?
He didn't say he would vote Trump and there's no evidence that he did. He was simply commenting that Biden was in decline, which was and is increasingly there for everyone to observe, and is highly concerning for a person who holds the most powerful office in the world.
You can disagree that his cognitive impairment disqualifies him from being president, fine, but to make that kind of comment is just not deserving of the outrage, and clearly the media whipped it up and perpetuated it in order to keep us all clicking and arguing.