Lindgren is worse at D than Georgiev was in goal. Not even kidding.
Better players have passed through the waiver wire in the last few weeks and you could have gotten a comparable player for a 7th or future considerations in the dying moments of the deadline. Not trying to pile on here, but you paid a premium for experience and intangibles.
Beyond that, he just seems like an awful fit for how you try to play.
Lindgren sucked last year too when the Rangers won the PT. This isn't some new development that can be tied to the rest of the team. In fact, the team's play really tanked when he was re-inserted into the top 4. Not the only reason, but probably the biggest one.
If you can't pair him with a guy who is really efficient at moving the puck, be prepared for a ton of failed clears, half assed flips to center ice that result in easy re-entries and a boat load of quality scoring chances against. Hell I'd prepare for those things even if he is paired with that kind of defenseman, they'll just happen more even more often if he isn't.
I wouldn't read too much into his "offensive outburst" either. Loads of secondary assists this year where he didn't really have anything to do with the play other than touching the puck before other guys did most (or all) of the work. This isn't really a repeatable skill and is luck driven AF.
He's not a player you can really hide either. He's gotten his f***ing carved away from Fox even in lesser minutes.