You can see the effect even more when it comes to recreational hobbies and sports. Americans don't really just walk or bike around. Walking and biking/cycling are usually specific activities, so most Americans buy special exercise clothing or exercise gear to go (by car) to specific spots friendly for walking and cycling to perform their recreational activities and come back. Walking is still a popular casual activity in urban areas but in a lot of suburban areas there aren't even the sidewalks in place to make it safe to walk around. Most Americans only really dress/prepare for the walk from their house to the car and from the car to the store/office/destination, then back if they're not specifically out to perform their recreational athletic hobbies.
(One thing the narrator mentions is shade: Keep in mind that Houston is a hot city, with temperatures often above 30c during the summer.)
But that's not unusual at all. In fact, where I grew up in Pennsylvania many roads had literally no sidewalk.
Let's say I want to walk into town where my parents live. I'd be going down this road (you can follow along on street view):
https://maps.app.goo.gl/huqH4kcT3h667RZr7
That's a narrow road, but don't let it fool you. People there drive fast and they're in a hurry. They certainly do not expect to see someone trudging along the berm of the road. Or more likely in a muddy ditch beside the road, because Pennsylvania is wet and that's the safest way to not get hit by a car.
If you walk along into North Wales, PA, pay attention to the pedestrian infrastructure. Where are there sidewalks? Are there crossing signals? How would you know when it's safe to cross? Now imagine doing this in the evening (note: there are no streetlights).
And I live in a city where the zoning can be described as "we'll rubber stamp literally anything that isn't hazmat processing we're desperate for money". And this is a ~150yo neighrborhood in a multi-hundred year old city in the northeast, not some socal dump that was built out long after the advent of cars.
Yes, because the number of stores in that 30 minutes is so low. Most of them are also setup for cars, including selling quantities that assume a car to get home.
(Besides that, a 30 minute walk can be inconvenient- the stuff you're buying might not support being carried for 30 minutes. I tried to get a friend to consider giving up a car-based life and they asked me how they're going to move their stuff for LAN parties and gun hobby related activities.)