You present this as a fact, but it would be absurd that Google would use such a cheap and easily detected trick to increase CTR. It would be bordering on ad fraud and I'm sure that Google, of all companies, knows better than that.
Occam's Razor says that this is a stupid async content loading bug, which they subsequently fixed. I've never seen this happen and when I just tried it without adblocker with that exact search term, it didn't - the page loaded with the ad.