The font URL is not requested until after the CSS containing it, so there should still be a (smaller) delay and FOUC.
SPDY should be enabled for both screenshots in the article.
The SPDY server could hint the usage of the font before the browser actually requests it.
Didn't know that! How so?
Client: Give me the style.css file.
Server: Here you go! Oh BTW you'll almost certainly need the prettyfont.ttf file too. Accept?