Its an older stat, it mainly circulated around some internet forums in the early 2000s. The guy who first started tracking it had a website, though he gave up on hockey after the 2005 lockout and shutdown the website, he let a few people in on how he came to it
@Striiker may be one of them, which is why it isnt very common. It makes use of a mixture of tertiary assists, zone entries, goals, assists, and teammates points with or without the player to determine how much a player helps vs relies on their teammates for their success. Giroux and Crosby are the leaders for the last few years (Giroux over Crosby by a few DPPG), players like Kopitar and Malkin are lower, suggesting that they benefit more from their teammates than their teammates benefit from them.