Either that, or call them / walk up to their desk and pick a point from the wall of text and ask them to explain what they mean by it. Then watch them turn red as they have no idea what the message they sent to you means.
I tried this when my skip level boss sent us a wall of text from ChatGPT that didn’t make any sense. He didn’t care. He said it was “just an idea”. He likely spent all of 5 minutes on it, while we spent a collective 15 hours dealing with it, before finally going to him and calling it out.
He’s sent a couple more emails like that since. I don’t even bother to read them once I see the format.
This feels like a BOFH response but I'm strangely not opposed to it; If you generate something, you should own it ... regardless of what tool you used to generate it.
I think you're over-estimating how much some people care.
I have had coworkers say "Oh I don't know, Claude added that" in response to questions like that without even a hint of shame or self-reflection.