Not to pile on the poor guy, but he does explicitly say he "creates designs" at the top header.

I'm surprised that an 'in-depth' article completely ignores closures and the peculiarities of their execution stack.

[edit]: FWIW, here's a more detailed explanation about all this that seems very straightforward and complete (from 2004). http://jibbering.com/faq/notes/closures/#clIRExSc