It will, but it's still a net win because Google's not actually optimizing for time to load. They're optimizing for time to usability. Moving all of the non-e

It will, but it's still a net win because Google's not actually optimizing for time to load. They're optimizing for time to usability. Moving all of the non-essential CSS out of the head and into a post-load request increases the total request time but decreases the time until the user can begin interacting with the page. It's still drastic overkill for almost everyone except Google, but it does make sense for their use case.