The parent and thread seemed to be arguing that low cost housing was intentionally built in places that disadvantaged the people who lived there.
Or, the only places to build houses with reasonable costs are in areas that weren’t already built out with very expensive houses.
Which will tend to be less desirable areas, by definition.
One approach, of course, would be to also make existing houses less expensive/desirable. Notably, wealthy people tend to have the resources to fight efforts to do that.
People don't build housing to intentionally disadvantage people but they do intentionally build housing for disadvantaged people