From study at your link:
“there are not enough data to support a recommendation for its [Ivermectin’s] use in higher-than-approved doses.”
“Ivermectin frenzy: the advocates, anti-vaxxers and telehealth companies driving demand”:
https://www.theguardian.com/world/2021/sep/13/ivermectin-treatment-covid-19-anti-vaxxers-advocates