I have heard lots of stupid things, and this is in the top ten indeed.
The first stupiditt is that people who use AI,.don't use it all the time. So no not all their respondes are generated.
The second stupidity is that using AI means they use it to generate responses. Maybe they only use it to gather information or automate work tasks.
And the third stupidity is that using AI means you don't also use your brain, thus "no conscience".
Applying the same logic, people who read books are NPCs too because all their responses are generated, no conscience there, just sentences taken from books.
/s just in case (referring to books)