>using LLMs without disclosure is A-OK?

'Without disclosure' is about taking credit for work that isn't yours.

WP defines 'ghostwriter' as: "a person hired to write literary or journalistic works, speeches, or other texts that are credited to another person as the author."

Anyone could choose to go through life relying on a reputation manufactured from many lies. They might want to think about how hard that reputation will hit the ground, if it does.