I bet this has more to do with the sudden delay than anything else. Valve probably considers the game "done" (hence their recent comments that the delay was untrue), but Vivendi is really concerned that it won't run well on the majority of systems out there.
Uh, Valve has been saying since the beginning the the minimum system requirements are a 700 MHZ CPU with a DirectX 6 (maybe 7?) video card. It won't look anywhere near as good as on a better system, but it will run at an acceptable frame rate.
But then again, with this last-minute delay, maybe Valve wasn't trustworthy about the requirements either.
Anyway, check out Planethalflife.com , they just posted a mini-editorial suggesting that the delay is just due to developmental causes (i.e. the game isn't done) rather than some outside force causing Valve to delay it. Seems reasonable.