It sounds like the person in question, the head of the presidential guard(?), had previously claimed that he only learned about Yoon's martial law declaration when it was proclaimed on TV. But if he was asking ChatGPT about it even before the cabinet meeting that decided on it, that means he was lying.
Considering that the whole affair is considered treason now and we now know of memos talking about "collecting persons of interest, put them in a ship and explode it" (no, seriously) --- there's a very good chance that the inner cabal who planned the coup would get life sentences or worse.
(I'm not sure how important was the person mentioned in the article - there are just too many bastards. It does seem like a random article to show up on HN.)