Though I fully approve the posted link, I do something similar in a different way; maybe it will work for you:
0. use firefox and ublock origin to take care of the ads
1. (re)enable custom search urls[0]
2. add https://www.google.com/search?udm=14&q=%s as such a custom search url
Steps 1 & 2 avoid the AI spam on default google by telling it to use the "web" search context ("udm=14").
You have to name your search url, so I call mine Plain Old Google, or POG for short.
0: https://gist.github.com/brootware/b72d3639d00d1cb9c3b138cf0e...