His defensive metrics have been bad for ages. However, some of those are misleading, so it's not the only measure. As a big Barbashev fan, I'll say that he's a good penalty killer, and he does have a 200 foot game, but it's incomplete. He goes to the right spots on the ice and he wins battles, but he often coughs up the puck in bad places that result in loss of possession or rushes against. I don't have stats to back it up, but it's my armchair belief that's why his metrics look bad: he's a poor possession player, but he's good at checking and good on the rush and around the net.