The document is now five years old and full of statements like “we’ll see that in the upcoming years”. I think it’s due for an update.
Looks unmaintained, though.
Edit:
> The initial QUIC protocol was designed by Jim Roskind at Google and was initially implemented in 2012, announced publicly to the world in 2013 when Google's experimentation broadened.
> Back then, QUIC was still claimed to be an acronym for "Quick UDP Internet Connections", but that has been dropped since then.