Google is effectively the actual determiner of Internet standards. As the article notes, Google implemented QUIC on their servers and their browsers, and therefore, 7% of Internet traffic is already QUIC-based, despite it not being officially accepted at this point. This is essentially the same as what happened with SPDY at the time.
As Google controls both the primary source of Internet traffic (up to 35-40% of all Internet traffic, depending who you ask, and a browser share in the what 65% range), Google can implement any new protocol it wants, and everyone else needs to support it or be left out.
Arguably, the IETF is no longer the controlling organization here: Google is. Should the IETF not approve Google's proposals, Google will continue to use them, and everyone else will continue to need to support them.
As the parent notes, Google both essentially determines these standards, and has an interested in faster networks so they can shove fatter payloads down the pipe. This is in part due to the ability to implement pervasive tracking, and of course, they operate a lot of content distribution products like YouTube.
Note that every method here that makes it harder for governments to censor and ISPs to prioritize also makes it harder for people to detect, inspect, and filter out Google's pervasive surveillance.