To be honest, he used to paste a lot of links to articles that were only obliquely related to the topic at hand, and which I often suspected he hadn't fully read.
Thinking about it now, I think the new thing of copying LLM output is worse for a couple of reasons. Although both are a sort of vampirism that sucks all the oxygen out of a text chain, at least pasting articles implies that one has read that article and agrees. Someone can be held responsible ror the selection. With LLM output, there's an implied shrugging off of any responsibility... it's not "here's something I read and agreed with," it's just "here's what ChatGPT said." There's less implicit effort, and less risk of staking one's credibility on something, because saying "hey, that article is junk science and these studies disprove it" would require a response beyond "well, ChatGPT can be wrong".
Secondly, and maybe more metaphysically or epistemologically, there's a certain decline in cognitive function that I associate with pasting LLM answers that goes beyond what was previously considered a lazy pasting of articles someone had speed-read or skimmed. (It also doesn't help interpersonally that my brother is a speed-reader who can form eloquent opinions on a document within seconds, although apparently it's fabulous in trial).
So you're right to point that out, but it's also a red flag to me that some sort of mass lead/heavy metal poisoning is happening to our society, to see both credulity and shirking of responsibility from one of the smartest people I know.
I'm just rambling now, but I also have a cousin who was an engineer for years on the Supercollider in Texas. Also a very intelligent guy. But during covid, he had retired by then, he started spamming the whole family with emails insisting that covid was actually caused by 5G radio waves and that vaccines were poison. I outright attacked him in a full family-wide email, telling him that I had lost all respect for his once-great mind, which I had formerly looked up to.
Somehow I feel like the lack of analytical discrimination, logic, and above all effort is the common thread here.