It's not fair but yes, it may help once AI users stop making obvious mistakes that give it away.

At least until the publisher secretly runs the content through AI by themselves. YouTube already does that with short videos, making them all look like AI generated content and making drawn animations etc look objectively worse.

Yes, I had to give up my cherished em-dashes.

If you are using one of the small handful of phrases that chatgpt hammers into everything it writes, yes you should change them if you don't want people to think you are a LLM.