Just as CGI has an uncanny valley, AI text has a similar feeling. Can definitely pick it up. Not everyone has the same level of pattern recognition.

AI stuff will get better, but people need to stop thinking of it as a replacement for thinking.

Writing is a form of thinking. There's an excellent short story, The Truth of Fact, the Truth of Feeling by Ted Chiang that explores this topic.

From Wikipedia:

The story is written as an article by an unnamed journalist in the near future, who tells his experience with a device that endows its users with eidetic memory, interspersed with a fictionalized account of an incident in which writing was introduced to an African tribe. The story serves as a reflection of how improving human memory affects people's personal lives.

If you want an interesting read, go check it out:
https://archive.org/details/ted-chiang-the-truth-of-fact-the-truth-of-feeling