I'm all for positive rise stems, nice upright riding position without fuck loads of spacers or excessively long steerer tubes, this one is 0°, with a stack height of 60mm.
If one needs to get more aero, do what I do, put a much larger riding companion on the front, and draft behind them, simples.
Positive rise stem on a custom bike is a real power move in my opinion. Would love one of these.