I don't think it's something in the past. There was even some tribute for Cage a few years back on TNT or something, and Johnny had a lot to say about him. Then just recently, there was some news that Cage was hit with a $5 million tax bill, and going in debt from bad management, and Johnny apparently helped "bail him out". If there's any truth to it, it sounds like a current (and good) friend to me.
What it means in socionics, I don't really care. I'm just pointing out these all-too-convenient friendships with possible ILEs. I'm embarassed to even admit knowing this People magazine shit.