Sure, but you write /some/ tests first. And that means, if you want to do it meaningfully, that you either need to zoom down in to tiny bits of functionality first in order to be able to write those tests (see the isPalindrome discussion in the article), or you write a test that requires most of the software to be finished, or you cheat and fudge it.

Making tests a central part of the process because they're useful to developers? Awesome. Dictating a workflow to developers that works in some cases as the One True Way: ridiculous.