Exactly. Its same for reviewing somebody else's code. How many companies did this perfectly before llms came? I know mine didn't. But these days people that aren't senior enough do reviews of llm output, and do a quick mental path through the code, see the success and approve it.
What could work - llm creating a very good test suite, for their own code changes and overall app (as much as feasible), and those tests need a hardcore review. Then actual code review doesn't have to be that deep. But if everybody is shipping like there is no tomorrow, edge cases will start biting hard and often.