I'm not going to lie to you, HN, this is just a stylesheet distributed as a browser extension because it's the easiest way for me both use it and keep it updated on all my browsers and devices.
But if you want to hide AI Overviews on desktop and mobile and have someone keeping an eye out for new variants (which is the perfect word for Google finding new ways to infect their search results with them) and hiding them in a timely manner, I'm your man.
Google seem to be continually adding new variants - in the last 12 hours I've pushed releases to hide AI Overviews now appearing as sections in the middle of search results, and as "People also ask" questions.
If you'd rather just grab the CSS, you can get it from the GitHub repo linked to from the website.