Technically, he's right. Saturn released before PS1, Dreamcast befor PS2, and 360 before PS3 and Nintendo has always been cheaper than Sony.
I just don't know what is the purpose of such a statement. Is it to imply that these two things have been the key to Sony's winning formula? If so, I'd have to disagree. The PS1 and PS2 were terribly unreliable and less capable than their competition. Sony didn't launch first but when they were most successful, they launched about a year before their MAIN competition (Nintendo/Microsoft).
The key to their success was games, games, mainstream pricepoint, and games. The key to their demise was launching later and much more expensive than the other guy. Hell, the PS3 didn't start doing better until a cheaper version was released.
This applies to their handhelds, too.
