Many people's understanding of "Google's hiring processes" is from a few articles over a decade ago. They had done numerous studies, switched things up, and now have a pretty solid approach to interviewing. This is one of the articles that was going around back then, and most of the conclusions are how Google still interviews: https://www.workforce.com/news/laszlo-bock-just-google-him

I work with many ex-Googlers that did a lot of interviewing and they process has been pretty consistent for many years now, and seen largely successful.