Quote from the article:

"Airport and airline officials said they convinced the TSA that creating special lines speeds all travelers through. By separating seasoned passengers who are familiar with security rules from vacationers who don't know they have to remove their shoes, the officials say, everyone moves through security more quickly."

I realize that quote is attributed to airport and airline officials, but where does TSA officially say that passengers have to remove their shoes? I guess that I am not a seasoned passenger when I don't remove my shoes.