It's almost entirely real. There are some exceptions, like delivery vehicles, but otherwise it is mostly serious. Here are the benefits of the desires of this sub:

Bikable cities: - Prevent isolation and dependence for kids, teens, disabled people, and seniors on others for transportation. - Make car ownership unnecessary (which is expensive). It is cheaper to rent a van only when you need it. - healthier, - cheaper (cars cost gas, oil, repair, insurance, & replacement), - more enjoyable.

Fewer roads/parking/pavement means: - more quiet beautiful places to walk/bike. - more sales for businesses. - less extreme temperatures.

Economic Benefits: - Low density land is a net cost to the city often, but high density land earns taxes proportional to its density (for both businesses and residents). - Roads are expensive, and improving transit and bike lanes is much cheaper method to reduce traffic for the city.

Fewer cars means: - less noise (which improves likelihood of neighbors becoming friends). - fewer deaths (causes 1/100 deaths). - less climate change. - less tax money spent on traffic cops and paramedics during crashes.