Tesla Model Y's battery is 771 kg. The motor in Model Y weights about 45 kg, about three times as much as the motor in the article. By reducing dual motor configuration weight from 90 kg to 28 kg, we reduce total powertrain weight by 7%.
But torque and power were never the limiting factor for an EV. You would only benefit on a track, and if you're taking a model Y there...
The motor is high torque, so I’d expect the drive shaft to be on the heavier end of that.
I’m not including the other power train components, but it’s easy to imagine it all adding to more than the weight of a second engine + wiring.
Also, having one more complicated power train is probably less efficient than two simpler ones, which implies a bigger battery.
This new motor is more powerful, that's it.
Nothing was said about cooling or voltage requirements. The latter is important because higher voltage is more dangerous to work with or be near.