The D has been fine. The numbers have been posted repeatedly for you, you just want to live in delusion where you don't like what the advanced stats say so you want to spin a narrative of "achsually I know better than the advanced stats". No you don't, you don't know shit.
The 5 on 5 D has been best part of the team's game this year. They have only allowed 4 more goals at 5 on 5 than Winnipeg has. 5 on 5 they have a lower GA than Florida and Vegas (the no.1 team in the division) and Vancouver (the other team ahead of them).
If the offense wasn't shit to start the year or the goalies trash, they should be no.1 or no.2 in the division now.
Even with the horrendous PK where the goalies are awful, the GA is significantly down overall this year versus the last two seasons. 53 GA versus 66GA last year and 61 GA two years ago through 17 games is a significant improvement. That's fact not an opinion.
Just because a 4th line scrub was cheating out of the zone and managed to get a partial breakaway doesn't invalidate all the work the D does. You're not going to stop teams from getting zero chances for entire periods at a time, that's not how hockey works.