That is why you ask for visualizations and test real failure scenarios to see if they are detected properly.

Large language models are not the same as they were 5 years ago. Pumping trillions of dollars to automate software engineering did som what pay off.. They are really quite good nowadays despite the amount of hate they still get. Often they can detect sloppy mistakes by human coders too.

Do not trust them blindly but test their results. Or use them only to generate tests on your artisan handwritten code to see if it can detect any mistakes.