When a dman is their teams' top point producer by 9 points, goes over ppg and has 38 points more than the next defenseman on the team, while also being tied for 21st in the whole NHL for points, than that is insanely impressive.
The last time a dman was over ppg was Mike Green 10 years ago, and Karlsson was exactly ppg 3 seasons ago. Aside from that you had Lidstrom in 2005 being ppg, and absolutely nobody else since Leetch in 1995.
If that's not impressive and worthy of at least a Norris nomination, I don't know what is.