Earlier quoted context omitted.
I would say the type of manager you describe could be more aptly called a leader: visionary (motivating the team behind ideals), willing to do the hardest work (as opposed to handing it down apathetically), respectful (building trust and such) and more.
"Leader" is usually reserved for a different kind of work. A leader determines where the organization should go; a manager ensures that everyone under him is marching in that direction. They require very different skillsets - leading is an outward-facing, synthesizing, strategic role, while managing is an inwards-facing, empathizing, tactical role. To use Ben Horowitz's terminology [1], leaders are Ones and managers…
That sounds like a boss to me (and not just because you used an unnecessarily gender-specific word ;). One of the anecdotes in the article is about this person, as a manager, acting as a listening board and ultimately conduit for an engineer when discussing the importance of a specific project at Twitter, and raising questions that came from that engineer that ultimately resulted in the project being cancelled. I think that advocacy role is important management – where the manager advocates both up and down (and ultimately you can't "tell" people what to do, you can only fire them or convince them, so it's "advocacy" both directions).