I think this is only really true for subway routes. The stop and go nature of buses slows a commute down and you don’t have a traffic-free route to make up for it. Subways are so much faster between stops that you can make up for the delays due to stopping.

In general, I feel once you make the conscious decision to build for cars and allocate vast amounts of space to parking everywhere then you’re going to generally do better with a car. Transit will only be more in line as you drive the % of drivers down and reduce the resource allocations for cars.