Having worked at sf.net for a few years as github was gaining ascendancy, I would say that we thought about this a lot. And while a lot of the things that he says are true, they're symptoms of why sf.net lost, not the real reason.

The real reason why sf.net lost was much more fundamental than that. Really it was so fundamental that it was a business problem rather than a technology problem. As a company, management just wasn't that interested in competing, and therefore we didn't have the institutional ability to focus on competing with some of the things github did.

I am proud to say that it looks like sf.net finally has a fork button, though, and it also looks (from the outside) like there's some focus on delivering developer oriented features now on sf.net, so that's a positive thing.

The engineering and ops team that's over there is awesome and has great open source pedigrees, and has always been super interested in working on things that would make open source development better and easier, but really has been hampered from doing that for years by more basic business issues. I think things might finally be turning around for them, though.