Gamers nexus released a video criticising Linus tech tips for their quality of videos. Highly recommend you watch it if youre familiar with LTT or are into tech in general
Tldr
It's just a bunch of controversy surrounding wrong data, incorrect facts in videos, poor quality assurance, giving products a bad review because they didn't follow instructions etc. They also auctioned off a one of a kind prototype sent in by a small company, who actually wants it back but they can't for obvious reasons.
Linus responded saying he's not going to talk about it in the WAN show (his podcast), and that his statement is enough. Said statement was apparently a bunch of nonsense. (I didn't read it thoroughly myself but that's the general consensus from others discussing)