Bergen's population is just over 200k. European cities or even large towns have prioritised public transportation and liveable infrastructure like this in a way that only New York really has in the US. I don't think there is a single 200-thousand-person city in the US where you can do a single things without a car.
I think what you mean to say is that there are few "medium" cities in the US where "techie and richer" people elect to voluntarily live without a car. You absolutely can live without a car in a lot of these cities but if and only if you want to bike. If you want to ride a lot of public transit it's gonna suck. What you can't do is do it in a trendy way that "befits your tax bracket" so to speak and prevents the white…
The only city in the US where you can live in most neighbourhoods and not be limited without a car is NY.
And all of those cities you mentioned are significantly larger (600-800k).