But they still pretend that you are saving time by not stopping for gas, and ignoring the 6-13 hours it takes to recharge for the 99% of customers for whom all their stops are not at a SuperCharger stop, and also ignoring the time spent driving out of one's way to find a charging station.
Accounting for that time, let's call it 100 hours a month since this whole page at Tesla is about making up numbers, at the new $50/hr, adds $5000 a month to the cost.
As long as Tesla is going to account for time one spends or loses as a result of refueling, the proper way to do this is to take all the time into account. Cherry picking one aspect of it is not honest.
It is an interesting marketing/psychological move however. I imagine most people in the market for a Tesla are going to be well compensated, and as such, they will see the initial $50/hr, jack it up to what their going rate is (probably in the hundreds) and see the 'effective' costs of owning a Tesla drop dramatically.
There are good reasons for getting a Tesla, but those aren't ones I'd use.