Running the wires out a spacer between the axle and a much larger ID sidecover bearing has been suggested and worked out in discussions for years here on ES.
A few commercial motors here and there over the years have done this, but most don't, probably because the larger ID bearing is more expensive compared to just notching or boring out the axle.
It means a stronger axle, because it isn't weakened by a notch or a cutout or beign hollow.
It means not having wires pinched or worn thru by rotating parts of the motor (like some of the bigger motors that run the wires just outside the axle core, but not all the way outside the whole axle like this one appears to).
It's good to see motors that do it the way we've talked about, the way this new Bafang appears to do.