Cars are great for people who do have all their limbs but lack the stamina to walk long distances, stand for long periods of time, carry large weights, etc.
Enabling and incentivizing able-bodied people to do things other than drive reduces traffic and parking pressure, expanding access for the people who are unable to function without cars (and long-term will, contrary to your concerns, reduce the portion of people whose physical condition prevents them from functioning without a car).
Sorry the poster didn't put a specific, individualized carve out for all of the disabled groups of people who would obviously be allowed to use whatever method in whatever imagined, hypothetical future, and not kicked to the curb like trash.
It is generally more productive to assume charity in the people you are talking to, that of course no one is going to ignore that some people need cars to get around.
If they don't want to be replied to like they believe in absolutes then they should not speak in absolutes. I'm so tired of having to “““assume””” that people would be inclusive of me and my needs when they outright say the opposite. Do better.