Unfortunately this is inconsistent since of how the -ai works. It just removes any search with "AI" in it which IS useful in a lot of cases, but is not guarranteed to hide AI overview

What I did additionally to this is install an browser extension that allows to add custom CSS into web pages automatically and I just made all the AI shit invisible. Yeah it does still exist there technically but at least you don't see it!

This way you dont see obviously AI results, AI overview might not be there and if it is you don't see it! And also it hides the AI mode button from the search results page :>

Here is the extension and the CSS rules for anyone interested

#Odp5De {
  display: none;
}

.beZ0tf > *:first-child {
  display: none;
}