"I do all my own writing, I never use an LLM"

Meaning comes from cost especially if the cost is unnecessary.

As Clay Shirky puts it, it's better to have your parents fly over to sing happy birthday to you than having a good singer's version of that song from a CD.

I've heard of people using LLMs to help write… and then putting in faux typos to make it look more authentic and hand-crafted.

LLMs make errors in reasoning, but they don't do typos.