Neither project mgmt nor scrum mgmt is inherently technical. While an understanding of the technical issues involved would of course be helpful (and will come to him over time, I'm sure), they're not required. I think it can be helpful to have someone who has no preconceived notions of "how things should be done"; such a person can bring a fresh perspective, and could act in a neutral fashion in any technical disagreements.
I don't know that the interactions would be any different. Obviously, you'd have to explain technical stuff more frequently to such a person.