I would hope that this is exactly the right forum to for this approach. Acknowledging that their own "impact per working hour" is probably less than Bostrom's... is the least I would expect from someone claiming to honestly evaluate their own skills.

I agree that the approach as summarized by you isn't very appealing, but to me the ad doesn't read like this. It's a difficult job to do well, and can be prestigious. Whether it is depends on the framing you apply.