This video seems a little bleak, perhaps a little too tongue-in-cheek. Depending on where I go in my city, you might see lots of people roaming around... on foot. Even in my little, old-fashioned suburb, there are people getting around with their feet!
I live in an older suburb. It's a town that grew quickly in the 1950s. Some of it has a great grid structure for the streets and later versions of street design have a bit less. At one point there probably wasn't a whole bunch of walking. Stores were too far away for you to take a stroll for a loaf of bread.
But nowadays, there's been a bunch of in-fill development. Much of it is commercial, so I can walk to several places.. a bakery, bar, couple of restaurants, groceries.
In fact, I even see a lot of people who appear to be just out for a stroll.
Fifteen years ago I had an Irish student stay out my house for the summer while she did an internship. She was shocked at how much Americans (her host family excluded) drove. I bet her that she would see the same thing back home within the decade. Less than a year later she contacted me to tell me I had won the bet. I view car use as an addiction; I define an addiction as any harmful habit. Like other habit-forming drugs, the car has a place, but creates a lot of woe when it is abused.
Where I live, it's still a taboo practice to walk for transportation's sake. Yes, people walk their dogs, and people walk and run for sport, but that's mostly how it goes.
Taboo? Maybe that's it. I do see some people schlepping groceries as they walk, but yes... a lot of people are just walking the dog. In fact, I almost never walk with groceries. It's much easier to make that trip by bike... I live about 1 km from the grocery store and I find that more than about 10 pounds of groceries (say a gallon of milk and some bread...) is my limit for that trip... on foot. I can easily carry 5 times that with my bike and trailer.
There are some contraptions that you can wheel behind you as you walk to help with the groceries. I would probably get one of those if I was walking that trip. But, as I say, I have a bicycle