Yes, I have watched them all. As I mentioned somewhere before I am a fan of both channels.

He never called Linus "insane" or "delusional" as the parent post claims, hence the request for evidence.

He (rightfully IMO) criticized some of his business practices (Honey, BilletLabs, "Trust me bro"), and quite a few more controversies which LTT was embroilled in.

He criticized Linus' behavior and lack of accountability based on his personal interaction with him, as well as publicly available evidence. At worst, called him a narcissit. If anything, he is vindicated by all the LTT apologies videos (one of which Linus and other staff even make puns and sponsor placements ...) that follow up each controversies.

Any more specific evidence you think show that "Rossmann has the habit of calling random people insane and delusional". I am willing to bet you have none.