Where do you see them claim their approach is better? Preferably with quotes.
It seems likely but I can't prove that behind a couple of statements like "As defined the feature is not powerful enough to push non-request related content (such as new RSS items)" is the fact that their approach does do it (and possibly had to add it on later only after they discovered it was a problem), but the document is very carefully written strictly as an examination of SPDY, with no braggadocio I can see at all or any trace of marketing beyond the initial statement of "Hey, we've done some stuff and here's some observations we are in a position to make".
It seems likely but I can't prove that behind a couple of statements like "As defined the feature is not powerful enough to push non-request related content (such as new RSS items)" is the fact that their approach does do it (and possibly had to add it on later only after they discovered it was a problem), but the document is very carefully written strictly as an examination of SPDY, with no braggadocio I can see at all or any trace of marketing beyond the initial statement of "Hey, we've done some stuff and here's some observations we are in a position to make".
(Again, my compliments to the chefs.)