About dosage, we don't know how many power exactly we need.
On the last study shared by you, they talk about 50mW/cm², the eardrum is about 1cm², a few people use 10W LED, I'm agree that the 3/4 of power don't go in the ear but there are about 2,5W on the eardrum, 2,5W/cm².
So 50X the power used...