I think that's his point. Outsourcing doesn't eliminate your responsibility as a customer to participate in the development process -- it just shifts part of the labor to another entity.

Telling an outsourcer "do X for me", where X isn't a well defined thing (ie. run a warehouse, manage windows servers, etc) is going to be a disaster. What does "add a shopping cart of my site" mean? Do you want to figure out sales tax for various jurisdictions? Do you need to to interface with the German banking system? Is there a configurator?

If you treat an outsourcer as a partner in development and participate in that process, you're either going to get a result that makes sense, or you'll figure out that the process isn't working out and terminate early.