I really really doubt this, openai said recently that ai detectors are pretty much impossible. And in the article they literally use the wrong name to refer to a different AI detector.
Especially when you can change Chatgpt's style by just asking it to write in a more casual way, "stylometrics" seems to be an improbable method for detecting ai as well.
It's in openai's best interests to say they're impossible. Completely regardless of the truth of if they are, that's the least trustworthy possible source to take into account when forming your understanding of this.