I think a large issue within that hurdle is that a lot of people simply won't want to learn, or apply the knowledge after learning.
I see this kind of error pretty frequently, and it's usually not a failure of mathematics... Most often, the person has some pre-existing negative emotional reaction to the stated conclusion, and their brain searches for something to criticize, in order to soothe those negative emotions.
I could only speculate as to why the original poster doesn't like hearing that an existing drug shows promise in treating COVID. Maybe they're a big Ivermectin booster, and they don't like the idea of another drug threatening their favorite?
OP is asking other posters to do quite a bit of homework for them... As in, "Is this study big enough?" <<YES>> "OK, but how big does it need to be to prove X?" ... At a certain point, it seems clear that OP is not arguing in good faith, because they feel compelled to make the critical statements, first, without understanding the topix.
I would caution you to not extend sympathy to OP's cause, simply because you happen to share a critical eye for this study. There is a HUGE difference between being right for the right reason, vs the wrong reason... and that's how we get crap like Ivermectin for COVID.