1. Non-science: calling Karol Sikora a "professor of medicine" hides the fact that he's an oncologist; if he ever had any expertise it was in cancer, not epidemics, and he has no business speaking outside his field. Sikora is also a fellow of The Princes Foundation For Integrated Health and a professional member of the generically-named College Of Medicine. Both of these organizations are lobbyists which promote alternative medicine.
2. Censorship: rather than allow conversation where real scientists can respond to Sikora's nonsense with facts, YouTube decided to push his followers into their own echo chambers where pieces like this which represents him as a martyr go unchallenged.
Sakora isn't a martyr: he's either an insane person or an amoral profiteering liar who doesn't care if his lies get people killed. But I don't think censorship is the answer to lies. Truth is the answer to lies.