Stuff like coding style and missing documentation is what your basic dumb formatter and linter are supposed to do, using a LLM for such things is hilarious overkill and waste of electricity.
I think what has happened is that there are a whole lot of younger programmers who have not used tooling like linters and static analyzers. For them, when AI does the same thing it is a revelation.
When your linter or static analyser says something, you know exactly what it means. When AI says something - many a time, it doesnt make sense. And I use AI code review tools every day.