I am only guessing, but I'm gonna bet the dudes on the last page are from the local medical association coming to "explain" how our heroine's alternative treatment is cutting into their action. Kind of like what happens in real life. 😑
You know, with the scare-demic going on, this is kind of depressing/sad, but I think that vibe is completely intentional on the mangaka's part. Yea, irony -- it's what's for dinner. 😑