It is incredibly difficult to read posts like this in good faith. More and more people come here to tell us not to believe facts, to disregard what our eyes and ears tell us. It is not hard to connect the dots
You do realize that the commenter does not hold those opinions, but gives them as examples of opinions other people voice? And then people started arguing with the content of the examples, which is a bit pointless when nobody even claims their content is true.
The most charitable interpretation of the comment is that the author's only opinion is that whether the disease is serious is heavily debated, which is still an opinion that can be disagreed with.