How could he have formed an opinion when he says he doesn't watch Mma?.
Well two reasons I could think of.
One he was active and fighting "prestige" fights against Almeida, Gracie, Serra, Penn and Koscheck. Seeing as how his income was tied to his fights I imagine he would like to hype his opponents up. He's retired now and he can be honest.
2-3 years ago Mike Swick, Dan Hardy, Thiago Alves, Jake Shields, Paulo Thiago and Paul Daley were in the title mix. Things have changed rather dramatically and the hype towards many of the fighters back then has dissipated.