Maybe, maybe not.
Besides ivermectin, Joe Rogan also took monoclonal antibodies, Z-pac, Prednisone, NAD drip, and a vitamin drip for 3 days. In his words, they threw the kitchen sink at it.
He also regularly exercises, regularly takes vitamins, regularly eats wild elk that he hunts himself with a f*ckin bow and arrow, and is otherwise a healthy individual with a functioning immune system..... so idk how you can point specifically at ivermectin as being the thing that "worked for him."