What a completely ridiculous statement. Why else would anyone choose BGP if not for performance (i.e. download speed)? The choice to use BGP over a plain old JPG would be made specifically by people who do care.
If that is true then the web does not care about SEO. And quite obviously it isn't weighted particularly hard at all (probably because there wouldn't be anything left).
edit:
Case in point, except for google.com (which itself has a terrible score of 62) I can't even find out a single google service that isn't in the reds on the pagespeed index.
What a completely ridiculous statement. Why else would anyone choose BGP if not for performance (i.e. download speed)? The choice to use BGP over a plain old JPG would be made specifically by people who do care.