How is the son of John Christopher Lydon and Eileen Barry related to Young's "Hey Hey, My My"?

The son of JC Lydon and Eileen Barry is John Joseph Lydon or Johnny Rotten

http://www.nndb.com/people/479/000024407/

Lyrics from ‘My My Hey Hey’

The king is gone but he's not forgotten
This is the story of a johnny rotten

http://www.lyricsfreak.com/n/neil+young/my+my+hey+hey_10190949.html

This deals with the fleeting nature of fame and how hard it is to stay relevant as an artist. "Rock and Roll Is Here to Stay" is a '50s song by Danny and the Juniors. Young alludes to or mentions artists from the '50s (Danny and the Juniors), '60s (Elvis), and '70s (The Sex Pistols, specifically lead singer Johnny Rotten) to show that "Rock and roll will never die."

http://www.songfacts.com/detail.php?id=1115


Why doesn't Young mention Johnny and The Moon Dogs?