The aircraft need to take off and land from somewhere, and given that they're multi-ton objects with rapidly-spinning metal protrusions, that'll need to be designated spaces. Designated spaces mean rate limiting - think of a taxi queue outside an airport. These will not just be allowed to fly _anywhere_ - they will have approved flight paths, because there's no way we'll allow a substantial number of flying vehicles to just fly wherever without some kind of controls, and they'll absolutely require more space between them than cars on a highway get. They've got a range of 90 miles, which is nice, but what's the turnaround time look like? How long between flights does it take to get the air taxi back in the air?
This may be a fine way for the wealthy to avoid traffic between their tower and the airport, but there's absolutely no world where this makes any kind of genuine impact on traffic or urban transit broadly.