It would truly be breathtaking for anyone informed to suggest that the forum, the context, the subject matter or the guest were so inconsequential because there are no comments below the youtube video that a poster recognized as "top scientists". The forum of the lecture, the institutions involved, the doctors involved, the speaker and the subject matter were all very serious and very substantial. I haven't ever seen serious comments below a youtube video on any serious and substantial topic because that's not the way to address the speaker or the institution.
So this seems like an unsubstantial and unserious means of attack.