They seem to have purchased the sections in bulk. Many are distributed along the way. Just keep those American steel mills hot & producing. (Great for the economy). Note the other structural project are not even mentioned — no competition in getting materials when needed !
There was rumor going around that only company who can manufacture those steel columns is one outfit in Israel whose owner is a buddy of Jared Kushner. Must be started by some TDS person. Good to see the steel is made right here in States.