I've noticed the same sort of empty calories from student writing and I know, without a doubt, it was artificially generated. There are other telltale signs, too. These pieces, while at the same time saying nothing, are nearly grammatically perfect. There are no misspelled words, and punctuation and other mechanics are almost always on-point. In my own writing, and even after several proof readings, I often miss little things - usually things that are produced during editing, but missed prior to submission to whatever medium. And I do this shit for a living. No one is that perfect.

The problem with academic writing, so far anyway, is that it is virtually impossible to "prove." We know, but short of outright plagiarism (which is quite easy to detect), it is difficult, at best, to prove students have not written what they say they did. There are ways of testing the knowledge that is, or should be, contained in some writing effort, and in important or extreme cases, that is an option. However, usually the content from AI is so bad that the grade, even without writing deductions, is still an adequate reflection of a given student's effort.