“His arguments only undermine the conception of free will as ultimate origination, but have nothing to say about (the more defensible) conception of free will as choosing on the basis of one’s desires.”
That is not “more defensible”, that’s inane. What’s the point of “freely choosing” what you want to do based on your desires...if you are not in control of your desires? It’s a pedantic technicality that ignores what laymen generally assume when they say “free will”...that they are in control of their own actions, as well as their own desires that act as motivation for their own actions.
If I develop a mind control device that implants “desires” in the mind of its targets, and the targets act predictably based on said “desires”, can you really say that the targets have ‘free will’?
EDIT: It’s possible that “free will” may somehow be “bounded” or “limited” (desires are selected, but you decide what you do with said desires), and that may be what you’re getting at, but if this is the case, I don’t think you should really call it “free will” then, lest it get confused with the broader interpretation of “free will” that is more commonly understood to be said definition of “free will”.
Knowing what you’re doing (which is really all that certification “signals”) seems to be higher status than being one of the few people that were lucky enough to receive enough start-up funding to establish a business and are skilled enough to hire people...who know what they’re doing.