Doctors don't need permission for off-label use. It's just not a thing. We're in strange territory where doctors (professionals) have been demoted to nurses and they can't profess.
So I don't see how your argument contradicts the one you are replying which says there is no an overwhelming amount of evidence for ivermectin as a good treatment for COVID.
I am also not against being used by doctors who have the time for trying it and seeing if works. As we don't have a wide available treatment which we know for sure (with a high probability) that will cure COVID then maybe trying various scenarios could be a way to cure more people. But we have to take into consideration that giving one treatment means not giving other treatments so it is not an easy choice.