This is correct, and it's why your conclusion is nonsensical.
No one is subsidizing luxury toys. The amount of damage done to roads by an e-Hummer or Rivian is mildly above that of, say, a Camry. Both do hundreds of times less damage than an 18-wheeler. The amount of damage done to a road by a passenger sedan is functionally zero, and for a Rivian or Hummer, it remains essentially zero.
The weight of large electric vehicles is an important issue! It makes a huge difference in cases of, for example, striking a pedestrian. But road damage is not a major issue for electric vehicles.
One caveat would be that a lot of road repair is funded via gas taxes, so road damage per dollar paid towards road repair may be lower for electric vehicles. But if we make heavy vehicles pair "their fair share", the Rivians will pay pennies, and the truckers will all go bankrupt.