At an absolute minimum he should have enabled caching and then measured performance on the second run both with and without SPDY. As someone who has setup a rig exactly like this, using a SPDY enabled reverse proxy, the benefits are enormous.
Many, many absolutely terrible ideas have persisted on HN because of the appeal to authority (like listening to Digg's opinion on databases). It is not useful.
But again, feel free to suggest better testing methodologies. I look forward to your results.
It's not a "study", per se, but it does corroborate Google's claims.