That is the key point.
This is meant to be a tax on luxury vehicles, yet for exactly the same level of luxury the EV driver pays it and the ICE driver does not.
Even if you view it as a tax on having too much cash to spare, for a car with exactly the same monthly ownership costs, the EV will pay the tax but the ICE will not, because the ICE costs are loaded towards running cost while EV are loaded towards initial purchase price.
To be fair, assuming this tax is a good idea in the first place, the threshold should be higher for EVs than ICEs.