Inevitable in the long run
It seems that this particular tax is particularly excessive (compared to the additional fuel tax for ICW cars).
Having said that, it is inevitable that the same taxes on conventional cars designed to fund the maintenance of the roads we all drive on will have to find their way to electric cars. While electricity is cheaper than gas, the cost of paving the road is the same regardless of the type of engine is in the car driving on it, so the tax to total cost ratio will be worse for EVs for the overall contribution of EVs to the road maintenance to be the same per car.
Given the social benefits of driving EVs, hopefully these taxes will be waived for a while to help motivate the transition, but at tome point, all cars will have to pay their share of the road infrastructure costs.