I'm going to call this bull unless you have some links to back it up.
If the developers say anything at all, it's that programming for the PS3 is different and more difficult than the other platforms. Porting between the 360 and PC is pretty doable, which is why we're seeing a lot of 360 games on the PC as well.
Also, for most of the cross-platform games the PS3 version is inferior, the only exception that I know of is Red Alert 3 and that was released 6 months after the 360 one.
Yea, the PS3 version is hurting in many of the games compared to the 360. In particular in the area of Anti Aliasing where 360 often do 4x and ps3 hardly manages 2x
That said, I like my PS3 and there are plenty of good games on it.
Of course that doesnt change the fact that I always pick the PC version of a game if I can.