Being loud and obnoxious is at best orthogonal to being correct. I'm not on either side on the LK99 question)
He explains why the video is bunk using information provided by the lab, and basic physics. And then 'replicates' using his own sheet of metal and a magnet.
Also, he raises the fact that it's a commercial lab.
I've downgraded my level expectations a couple of orders of magnitude. But hey, let's hope for a miracle.
Thunderfoot comment though seems ridiculous. It would be irrelevant because it is a ceramic??? lol. They proposed a mechanism how it works! Obviously this would just be the first step. That's like saying the first transistor was irrelevant because we don't use that design anymore.
He's really laying on the sarcasm during the intro, I could totally see that getting misconstrued by someone not familiar with our flavour of sarcasm.
I get probably this is a popular video maker in whatever sphere he's in, but as an outsider, it's difficult to get into the video because of what I attribute as the presenter's YouTube personality.
(also it very much so bugs me to see people using Chrome and see all the nags for notifications, the random extensions/features, etc. And any browser without uBlock origin throws me as it takes me a minute to realize why all the websites look so bad, but that's just a personal issue :) )