He glosses over it, but basically he appears to be a biz guy who had lost his technical cofounders for some reason and had his (idiosyncratic and evidently tenatative) acceptance rescinded.
Hi, Jon here! Actually, I'm the technical founder. I'm a Ruby on Rails developer originally (have commits in Rails itself). The other founders were graphic design and sales. For about 6 months (post YC incident), I was doing design, engineering, customer support, and fundraising for our seed round with just the help of my wife helping out with Community and writing.
Sometimes I miss those days. :)