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Here are more studies on the mechanism of Ivermectin on SARS-COV2

"Computational molecular modeling was used to screen 3987 FDA approved drugs..."

and here:

"Homology modeling of the viral proteins was performed using the SWISS-MODEL server2 with default settings.

More to the point, that study didn't characterize ivermectin as a protease inhibitor:

"Many drugs have been found to possess potential antiviral activity against SARS-CoV-2. These include old antimalarial drugs (chloroquine phosphate, chloroquine, and hydroxychloroquine) (Wang M. et al., 2020), an anthelmintic drug (ivermectin) (Caly et al., 2020), viral RNA polymerase inhibitors (remdesivir and favipiravir) (National Health Commission of the People’s Republic of China, 2020; Wang M. et al., 2020) and viral protease inhibitors (Mugisha et al., 2020)."

I really don't care what you think of ivermectin but it matters when you tell people something's been shown in clinical studies when it hasn't.