I don’t know the answer to your question, but I’m not sure how relevant that is. There are lots of medications regarding which we are not sure the exact mechanism. If the data supports them working then they work and if not not.
Tylenol (acetinominophen) is one of the most widely used drugs out there, yet its exact mechanism of action is unknown. I don’t think that is an argument not to use it .
One thing that bugs be though is the incessant description of Ivermectin as a “horse pill” It is FDA approved for humans (though not for Covid-19) It shouldn’t be used because data doesn’t support its use not because it is a “horse pill”
(Of course horse doses and formulations are “horse pills”)