I just checked on my phone and it's only showing back to episode 204.
Me too, but when I go into the iTunes store it has all the episodes, going to back to episode 5. I don't know why that is. The first 4 episodes are still online but they ain't listed. It's weird.
iTunes uses this RSS feed: http://stoppodcastingyourself.libsyn.org/rss
I just loaded it on its own and it only went back to 204. Then I reloaded and it went back all the way.
In short, I have no idea but all the media is still available.