It’s the Prius-ing of trucks!
No not exactly.
If you read the article it’s adding a booster electric motor to the trailer itself, that helps with acceleration
Acceleration, particularly from a low speed or stopped takes a lot of energy. Overcoming inertia. In a semi the trailer is dead weight being pulled by the cab.
With a motor on the trailer that recognizes the cab is trying to accelerate and adds drive energy to the trailers wheels as well will help reduce the need for all torque and power to come directly from the cab engine
This is an addition of a desiel electric hybrid to the trailer. The cab remains ICE.