It'd be cool, but would of course exclude the (IMO large) set of people who aren't trying to keep their job search below the radar.
This idea is somewhat cool in that if there were a few people who interested me, I could scan their comment history (or might recognize the username) to get a sense of their style of interaction, thinking, passions, etc..
A throwaway account means there's none of that; and unfortunately, it also means there's no way to distinguish you from someone who read an article and is posting their inflated self-description on HN along with 219 other places.
I'd be curious to see a trial run, but I don't have very high hopes.