Possibly. In the article, he mentions that he has one million lines of Java in production.

I wish there was someone around who has had a chance to look at some of his code. Something I've noticed from years of doing code reviews and consulting is that people who are that verbose in their writing tend to be very verbose in their coding. I wonder if Steve generates massive classes when they could be done much smaller.

Again, it's totally unfounded, I'm just speaking from anecdotal evidence.

Maybe he uses a fast keyboard? I've heard wonders about these:

http://www.datahand.com/products/proii.htm

Well, he said he types 120 wpm, he was transcribing a presentation he already gave, and it has been a month since he wrote anything. Not that hard.

It's a transcript of an hour long talk, so it's not that much as that and worse to read.