They "hijack" the search result url on any result. If you copy the address from the search result link, you always get a google link. But you could be talking about another url.
At least when you follow the link you end up at the "real" URL. With this it doesn't appear that you do.
Google's done that for years (not that it makes it any better, it's just not related to AMP). e.g. if I search 'Hacker News' and copy the link I get: