It's not bull****, it's a survey. Why the hell would Valve fake on of their own surveys? So modders will purposely mod with SSE2 in mind, only to find out no one apparently has it?
How can you seriously still compare ESF to "A HALF LIFE 1 MOD." when it pretty much obvious from the current screenshots, it doesn't look ANYTHING like any other ordinary HL1 mod. Seriously, when Crytek started developing Crysis, and you found out your computer was too crappy to run their game...did you go to their forums complaing about how they made the game too pretty? It's the same here. Technology advances, games demand more power...and if you want to play them, you either upgrade or don't play it. You can't forever take the time to develop for older systems. And in computer-years, 6 years is a lot. You are not just 1 or 2 generations behind with your CPU, no, you are MANY generations behind. We have had more powerful single core CPU's than you have now. We have had Core Duo processors (2 generations?), Core 2 Duo processors (3 generations), Quad Core processors (1 or 2 generations?) and now Core I processors ( already at...2 or 3 generations. i7, newer i7, i5)
Basically, you CPU is outdated by like 8 generations of CPU's. Quit whining and start upgrading. A 5 generation old CPU should be able to handle ESF (well SSE2 at least), and you can probably find those on ebay for less than 5 dollars.