I wonder after how much editing an LLM output wont be reliably detectable? And what the EU law even says about this. I find that a good LLM workflow can be to g

I wonder after how much editing an LLM output wont be reliably detectable? And what the EU law even says about this. I find that a good LLM workflow can be to generate outlines that are then edited pretty heavily manually to fit into whatever context it will be published in.