On HN we've been seeing a bunch of these hyper-targeted reverse resumes in the past year because I suspect people have gotten tired of submitting waves of resumes and hearing nothing back within a reasonable timeframe from companies that advertise open positions on their websites but never, for whatever reason, respond.
What i'm seeing here, is that traditional recruiting practices are failing in some way because priority is achieved by a) making it to the hn frontpage which b) gets pg to vouch for you. Which is basically no better (or efficient) than the traditional method of hiring folks that you've networked with via friends/school/etc or what have you.
I understand that historically those online resume systems are a real losing proposition for applicants, but this suggests that they're more like a black hole rather than a mail slot.
Again, this is a critique of these automated systems which seem to be visibly failing because people are going out of their way to subvert them in order to achieve any success.