I have no doubt that in major cities, we can find highways between predominantly black areas and predominantly white areas. What the piece leaves out are the multitude of highways that separate more affluent white communities from other more affluent white communities. For example, up here in Milwaukee, highways separate Brookfield from West Allis, from Pewaukee, from Waukesha, from New Berlin. All white areas of the city and outlying areas.
This theory and explanation also neglects an obvious point: highways are often economic boons to the communities through which they are built. We have all seen examples of communities in perpetual decline after a highway is moved from the city. So, you are free to describe the construction of highways through communities as "ripping them apart," but, at least economically, that may not be the case at all.
Finally, the author asserts that highways were often built in low income, minority-majority communities because people there lacked political power and could not fight back against eminent domain. How successful were majority-white communities at fighting eminent domain? That has always been an enormous challenge, period.