This has not been my experience, to be honest -- I wrote a pretty complex scraper for extracting portions of a page and structuring their contents into JSON, using ChatGPT-4, about a year ago and it worked pretty well. (But not "well" in the sense that a non-programmer would've been able to do this, if that's your bar.)
I even got it usefully updated when the format changed!
It could depend on the page. In my case it was almost half a megabyte, mostly HTML markup junk, and the text was in Japanese. https://kakuyomu.jp/works/16818023214223186311 And the task was "write a selector to identify the author". I even tried giving it the author, didn't help.
I even got it usefully updated when the format changed!