Left hand lug nuts are back, baby!

Boy, after setting this pot on boil, I realized that the bit of information I got (left hand thread) was actually split between 2 races. Both Xfinity and Cup series run new cars, but I heard the Xfinity cars still run 5 RH lugs and the cup series run the single LH/RH hub nut. So when I heard the lug nut comment (in the cup race) , I naturally assumed the old was new again until I was told the xfinity cars still run 5 lugs. Make sense? Am I wrong on the Xfinity cars having the old 5 lugs?