In addition to affirmation of the consequent he's also employing attacking a strawman, petitio principii, faulty analogy, and goalpost shifting, at least. His followup example "Note that a tree implies it is made of wood. If you find a stick of wood, odds are it came from a tree." is hilarious. No doubt there are numerous other examples completely unrelated to coders and whiteboard tests where A implies B and B is highly correlated to A, but their existence tells us nothing about coders and whiteboard tests and doesn't justify a blatant fallacy of affirmation of the consequent.

Here's something to consider: just because someone is good at writing compilers or designing a language, that doesn't entail anything about the quality of their arguments.