Urk has claimed to be considerably higher rated OTB than blitz, and hence that blitz ratings are deflated. I don't believe that blitz ratings are really deflated, so I just believe he's pretty bad at blitz, relative to his classical.
But then he said he used the app, instead of a computer, and that explained it pretty much. The chess.com app is pretty horrible. I actually tried it out, and it takes 30 seconds for me to submit a single move for one of my daily games. Just one of the pretty bad elements of the app.
Some people just like the taste of eggs.