Only new sales, and that can be and likely will be moved farther to the future. If there are almost no charging options (relative to the number of cars) even in big cities, then ban will go nowhere. E.g. if it's year 2035 and I still won't have anywhere to charge EV, then I won't buy it, bans or no.

PS: 500-1000 stations per 1000000 of people with hundreds of thousands of cars is nothing really. Sure, they can service some luxury EVs now, and that's about it.