There is this factory for lack of a better word near me that makes houses, packages them on a truck in pieces, and will ship them around the US to a foundation. All is said and done it's _maybe_ 100k cheaper to go with them than to buy the land and find your own contractors (and when the cost is between 300k-750k either way it doesn't really matter).
The essay touches on why this is the case, but fundamentally the issue with homebuilding isn't that we haven't optimized how to build houses. It's that only certain small segments of the population have seen anything but crushing decreases in wages on top of rampant inflation. So of course, when the average income of a region is 35k and the average house is 650k, there are issues that optimizing can't solve.