if it's under your name, and you didn't write it, it becomes...
...plagiarism. Obviously. Of course it does.
So, with a little more sincerity and seriousness than a “Content Warning” (or CW), be sure to label any of the ChatGPT stuff with “#AI”, or something to indicate that the person “posing” as having written it, did not, in fact, write it.
On that, I never understood the act/crime of plagiarism. If you can't put forward a thing honestly, then why? It's like stealing a trophy. All meaning is lost!