Walking around a modern suburban development devoid of people, houses, pets, etc. would be at least unusual in the feeling. The spaces are intentionally designed to put people and their things within obvious boundaries. With the boundaries still there but lacking the things within them it becomes quite a different experience.
There actually used to be this "empty suburb" feeling at many times per day when a typical bedroom community had sent its kids to school and parent to work. Particularly when they were not wealthy enough to have paid laborers around doing things during their work day. If anything, they got busier since COVID as people have more varied schedules.
Then there is the new but incomplete development, e.g. with graded lots and some subset of streets and walkways. If work is suspended for some reason, it may be decorated with idled earth movers, piles of building materials, or partial foundations or framing.
Or it might turn into the next type, which is an aborted subdivision build or after a severe wildfire, which is basically a moonscape of graded lots with no buildings nor vegetation.
Then there are the abandoned neighborhoods that were once vibrant. Old, decrepit buildings, and wild vegetation, e.g. around dead industrial towns.
Its the combination of capitalism and lowest bidder architecture that is alienating to humans. And if humans are present, makes the space tolerable.
Remove the humans, and the space is off-putting, eerie and has a sense of dread.
And yeah, brutalism (usage of concrete as primary architecture) is also seen in the USA. And frankly, most of the buildings feel like prisons, and not where you want to go. Look no further than Indiana Univerity Hermann Wells library. https://maps.app.goo.gl/6FDvKR9sHSk3z8v56
Brutalist buildings feel directly hostile to humans, and not a vague sense of dread.
However I had the pleasure of seeing a brutalist hotel in Iceland (Fosshotel Vatnajokull) which combines concrete with wood. It felt sturdy and powerful, but also soft and welcoming. https://maps.app.goo.gl/wnXEawh2wptmQ3Rd7
But yeah, I do think youre on the right track. It really is related to capitalism and making horrible spaces (malls, etc). And without people, they are alienating and mild dread-inducing.