Just watched the movie. The dedication and effort by Jenison is absolutely astounding, and the level of 'madness' involved in the project becomes much more palpable than the article can portray IMO. For my money, I feel pretty confident Vermeer used this, or a very similar, method.
It doesn't really take anything away from Vermeer's paintings, but I just can't fathom why he or anybody else would want to put oneself through something like this! From Jenison's description, since you completely remove the artistic and creative element, it gets extremely boring. Fast. You literally just paint what you see; there is absolutely nothing creative about the actual painting at all. Whatever creative or artistic element there is, it ends with the disposition.