The shaft it's designed to be just a centering pin, the pulley (originally the propeller hub) should be bolted to the spinning part of the motor case, and the motor should be mounted on the non-spinning part as usual.
It's aimed towards high-efficiency or Heavy-Lift multi rotor drones that uses larger than usual propellers, I guess this motors are derived from stabilization gimbal motors, an I've seen the used on DIY robotics project to actuate limb-like assemblies.
On the spreadsheet from Odrive I've linked whey they compare some motors, it's the second worst one in the RPM chart with no Load, but the second best in the torque chart, I deduce they designed this with torque in mind.
I am also assuming that the APS 5063 specs are comparable to the ones of the 5065 that can be seen compared in that same spreadsheet, I did not considering weight as a big constraint will not move to much, but it could become an issue if the weight on the motor would put strain on some moving parts, the still parts can be made bigger-tougher to withstand the weight.