The medical commmunity will almost always be skeptical of new theories, sometimes this is well placed but sometimes it isn't.
That's neither here nor there though, the main takeaway is you probably shouldn't go to economists for medical advice.
1. The exercise, diet, sunlight, zinc, and vitamin d results all seem plausible. They are well known to improve your immune system.
2. Remdesivir was originally recommended for covid19 but then they stopped using it. I'm surprised the plasma has such a poor result because that was heavily hailed originally too.
3. Paxlovid and HCQ are both widely recommended, in line with the results presented.
The main point I wanted to make is Borody is far from alone in being interested in c19 and ivermectin.