You're missing two things:
1. The parking lots, freeways, and such that the US builds so much of, at such large scale, is still very expensive.
2. From the article, Chuck's point is almost the same as yours. We have plenty of expertise -- but our experts have been conditioned by the enormous wealth for almost two generations after WW2 to develop systems that are good at all sorts of metrics, but affordability is not one of them.
Whereas your point is that other countries have more experience building things and having to worry about the budget.
I think the reason that these things get talked about mostly regarding transit etc. is that projects that are uncommon in the US naturally attract more attention / skepticism.
As an anecdote, years ago I remember driving in the Austin area listening to local radio and hearing two segments back to back, which went something like this...
Segment 1: "The local light rail plan is a boondoggle, you know they spent $80 million on that thing and hardly anyone rides it! Just imagine how many new schools we could have built for that money!"
Segment 2: "The DOT is considering a highway expansion to help deal with traffic in Bee Cave... this project is estimated to cost $400M, which sounds like a lot, but it's actually pretty reasonable as a percentage of the state's overall budget..."
For context the light rail line was built, it was the first rail project in the Austin area and spanned some 32 miles but has very few stops, is slow, and has very little capacity (because, surprise, they built it as cheaply as they could).[1]
The freeway expansion project is a plan for just a few miles, really to deal with one funky intersection where US290 stops being a freeway. It hasn't happened yet, and maybe won't.[2]
The point of this anecdote is that the entire conversation around infrastructure projects is pretty strange. We spend huge sums of money on "routine" mega freeway projects all the time, and we just think that's normal. Even "simple" residential streets cost a lot more than people realize, and in most cases a lot more than the taxable value of the homes would justify. But we've been so wealthy for so long that we got away with all that without anyone questioning it.
Now that our wealth is fading, we've got a lot of difficult questions facing us.
[1]: https://en.wikipedia.org/wiki/Capital_MetroRail
[2]: https://www.oakhillparkway.com/about/