You are right about this.

The people who understand and know how to use AI for writing are the one who can edit and make the written content sound more human.

It is only learners of AI who don't edit i.e. copy from AI and post directly paste to social media are the ones whose content can be detected by AI detectors.

I have personally used AI for crafting social media posts(for some accounts I manage) especially tweets and I do a little edits.

I'm sure 80% of Crypto Twitter uses AI for their posts but we have no proof hehe.