The thing is that writing - especially writing well - is fairly hard, and does take time and mental effort. So lazy authors (or wannabe authors) take the shortcut. But the fact remains that most of us do not want to read AI-generated slop, and human-written slop is not much better.
So there is a point to the quote, no matter how many times you've read it. But there is a countering point as well: If you don't have time, don't write. Don't use that as an excuse to get lazy and shove slop at us.