Note there are no Massive Columns inside the core area. the steel that is there is support for elevator guide rails.
I count at least 6 interior columns in Gravy's picture and that's without zooming into for a closer examination.
As I pointed out at http://noconcretecore.741.com/ elevator guide rails don't get installed during structural installation. They just get in the way, and get damaged. Not to mention they have to be perfectly plumb to the walls and the only way to guarantee that is to wait until the shaft is complete.