I agree it's possible. I disagree it's compatible with seeing product management as being about consistent execution of plans.
Ah, I read that phrase differently, but think I see your point now. There's definitely a type of "plan" that can be very micromanagey, and problematic.
I've lucked out and most plans I've worked with are super, super high level and gives everyone a lot of freedom.
I don't believe his view conflicts with yours.
I think it's very possible to have someone present to help define value and priorities, and focus on the people part of getting shit built, while giving engineers a lot of creative involvement and ownership.