Don't put too much faith in what Markus says. He lies about everything. Constantly.

I think he thinks it's a strategic advantage to understate the work and resources he's invested into pof. (Makes for a good marketing story and newbies think building a pof clone is easy so they waste lots of money trying.)

Right about the time that blog post was written peer1 had a marketing video on their site where there was a guy walking about a data center being interviewed by someone off-camera. As they walked around the guy waved at a few racks of servers and said these are plenty of fish's servers, walked further, these are [some other big web site].. And from that video it was clear there was no way he was only using 1 server. There were lots of servers in use.

POF uses a CDN, which runs on multiple servers, nobody has ever claimed otherwise. The claim (that I haven't seen disproven) is that it's one one application or one database server.