I don't see how you changed anything by pointing out that you assume that this is written by an LLM. What was gained? I don't really see anything. Do you think anyone is dissuaded from reading the article or from using an LLM the next they write something because you could maybe probably tell that it's probably written by an LLM?
I think we all lose more than we gain if we do this. We look at each other with mistrust over whether they used an LLM and we point fingers as soon as we see a sign of "wrongdoing". I see artists and writers frustrated about being accused of using ML tools. And the people who just use LLMs and image generation tools mostly just don't care.
The whole "AI" industry makes everything diffuse. We have to go by vibes if something is made by a human or not and the signs are ever more subtle. We have to be so incredibly careful not to accuse those who are on our side. People who create real human work.
For me the easiest solution for now is to stop accusing. Unless you know for certain that there was not a real human behind it don't point fingers.