The argument should have been that it takes time to transition off petrol cars and poor people need more time to transition so hasty decisions like banning gas stations should only be done in conjunction with policy that speeds up the transition.
However they typically live where they can get by without a car, as even a cheap car requires unexpected $700 repairs and can not be relied upon.
A lot of the car-dependent design of most of the US is to try to keep people like that out of neighborhoods.
Many don't even have a driver's license they get a "voluntary ID" card, government issued. At best they'd get a pre-paid credit card or maybe a debit card. But most often it's cash only. All those payday loan stores exist for a reason!
As for expense, the total cost of ownership for electric vehicles is often less than equivalent gas vehicles, even if the purchase price is slightly higher.
When a car is paid for by a loan, this lower total cost of ownership is directly realized in the monthly payment. If a person is paying up front with cash on a car, they are making their own value judgement about the time value of money, and can choose to finance whatever portion the prefer in order to realize this lower TCO.