Simply no. This is a catchphrase, a buzzword from compiler companies. We have seen here on HN time and time again many articles showing the truth to be the opposite of what you've said. It's time to put to rest the nonsense that compilers optimize better than humans. Here a few examples I've talked about:
https://news.ycombinator.com/item?id=8508923 https://news.ycombinator.com/item?id=36618344 https://news.ycombinator.com/item?id=41922295 https://news.ycombinator.com/item?id=44186843 https://news.ycombinator.com/item?id=44177446 https://news.ycombinator.com/item?id=36949314