The template might still be using physX idk, but chaos vehicles do work, just make a new one. If your car is hanging in the air, make sure you have the mesh set to simulate physics and your wheel colliders are set to kinematic. (and you have a animBP that is a vehicleAnimInstance and you put a wheel controller node in there)
It looks like there are two movement components, if you make a pawn derived from wheeledVehiclePawn it will use VehicleMovementComponent. But if you just make a new pawn and add chaosWheeledVehicleMovement. Both work and use chaos, and seem to be basically the same but chaosWheeledVehicleMovement has the engine RPM exposed to bp.
If the car doesn’t move, try increasing the Engine Rev Up MOI, my car move reeeeaaallly slow and increasing that fixed it.
It seems that PXVIS no longer works, but I did find typing p.vehicle in the cmd bring up a lot of options to show debug stuff