Kaz can't possibly be stupid, or egotistical, enough to actually believe what is written here. I don't know if the source interview was conducted in English and Kaz doesn't speak English well, or if the source was in Japanese and this is how it wound up translated, but what Kaz is allegedly saying here really makes no sense on a number of levels.
You don't deliberately make a console difficult to develop for just to prolong the development lifecycle and artificially inflate the learning curve. I can only assume what Kaz meant was that Sony went with the most powerful thing they could offer, and if the developers can't figure it out, so be it, Kaz isn't going to apologize for Sony pushing the envelope.
Obviously, the jumps from Resistance to Killzone 2, or even just MotorStorm to Pacific Rift, suggest there WAS a HUGE learning curve, and probably still is to tap all the power of the system.
