This guy is dogfooding outsourcing. He is outsourcing Taskarmy.com which is related to outsourcing itself. So on the one hand it is an awesome exercise... On the other, he is saying "nice things" about a concept he needs to "sell".
But as he himself says, certain things are hard to outsource. For Example the particular blog post itself. Outsourcing the webdesign and the code behind the site would have been a lot more easier. So in a strange sense, even a skeptic has to agree with his point... A site like Taskarmy can fail due to bad technology but will not succeed due to its technical prowess. What he needs to figure out is how to connect the buyers and the sellers and make them stick around. All the CRUD that goes into his site will not be the secret sauce. The only possible real secret sauce is probably a method to connect the buyers and sellers using an algorithm that beats the competition heads down. In such a case it makes sense for him to keep the "secret sauce" to himself. Everything else is a commodity until he becomes a huge player. If one is at twitter scale, even status messages become "rocket science" and cannot be outsourced.