Interesting. It’s not double blind and I’m not sure how practical this is but it does cast a lot of doubt on the conclusion that ivermectin doesn’t do anything unless the dose is lethal.
The effect size is smaller than from wearing a good mask.
And be sure to keep in mind that the vast majority of infections occur at home where I sincerely doubt people are wearing masks.
If you want not to die from COVID-19, getting fully vaccinated is the way. If you want not to catch and spread it (vaccinated or no) wear a mask when you might be exposed or expose others. If you can't get vaccinated, anyway do things to be healthy -- treat any parasite infections, eat well, sleep well, eat well, exercise.
People aren’t going to wear masks forever and aren’t going to take boosters forever so we need more solutions. And before you say, they aren’t going to take ivermectin forever either but that doesn’t mean it’s not useful to know if, why and how it works.