TSA agents are paid for by, among others, me. I don't care for them to "pop over" so Elon Musk or Bernie Sanders can get a nice private screening without rubbing elbows with us filthy commoners. You want to use my TSA agents, Bill Gates? Then come over and get screened with the rest of us.
I thought the article said the people using this terminal were screened by the TSA (at the luxury terminal) and then driven to their commercial flights.
Far as I know, Elon Musk and Bill Gates fly on private jets and there is no TSA screening when flying on a general aviation aircraft.