This is one of those moments where citing a source (that experiment) would be incredibly useful...
I remember one of the other key takeaways was that the manager role was treated more favorably--specifically that they apologized they could only offer some (reasonable) amount of relocation assistance while none was even offered in the developer role. It was theorized that managers were seen as an "in group" among other managers, but that was obviously just speculation.
I wasn't on HN at the time, so I can't confirm it was here. It was one of those blog posts / write-ups that made the rounds.