I don't actually doubt that there is
some truth to what he says. However, I also think the game itself is to blame and I don't see the Bioshock or Call Of Duty 4 publishers complaining about cannibalised sales from the PC versions. The strange thing is that Far Cry 2, also by Ubisoft, is going for a simultaneous release - a bit of hypocrisy there.
What is needed for PC is an effective way to stop piracy. Current DRM only punishes legitimate users, making it completely counter-productive. I heard things about TPM but virtually no motherboards are including it and it doesn't seem to be going anywhere fast (apart from in the business laptop world).
"The price of freedom is eternal vigilance."