You left off the rest of the quote. The PSN doesn't have as many basic features as XBL to build upon, but it's in general a more open platform for developers, allowing them to get very creative with their online implementation. Excellent examples of this are LittleBigPlanet and Demon's Souls.
Developers have a wider spectrum of possibilities with PSN versus Live, but you'll probably only see SCE funded developers making the most of them. Meanwhile it's missing a few basic features (universal party system + cross game voice chat) that effects all titles equally.