Not "significant," no. If you read back, I objected and continue to object to your characterization of the contact... There's head contact but it's not the primary point of impact; it's sure not clobbering; and it's incidental, occurring despite Wilson doing every single thing the DoPs told him 2 years ago he had to do to clean up his act. So your position is effectively that Wilson cannot hit guys, even legally, because they might get hurt.
Incidental or not, accidental or not, it was a reasonable outcome given the hit Wilson was trying to deliver. This wasn't some freak one in a million accident. He missed his target, and he has missed his target several times before. Had his hand not made contact with Carlo's head, it's reasonable to believe Carlo's head would not have slammed into the glass violently, which according to the DoPS video is why this hit was suspendable. Indeed the slo-mo video shows to me that Carlo's head does not move toward the glass until Tom Wilson's hand impacts his head. And if there was not a lot of force, and it was merely a grazing blow or similar, then Brandon Carlo's head would not have flown into the boards like it did and he would not have sustained an injury like he did. It doesn't matter that his hands weren't extended from his body, his hands came up high and hard. I'm not going to quibble about "primary" point of contact because this isn't an illegal check to the head, it's boarding. Boarding does not require the head to be the primary point of contact, it does not require it to be a hit from behind. It was a significant impact with the head because if it were not significant, then Brandon Carlo's head would not have violently impacted the boards and he would not be out week-to-week with a concussion or other head/neck injuries.
Of course Wilson can legally hit guys, but he like everyone else accepts a risk if it goes wrong. The DoPS did not say he could make contact with a player's head along the glass with his hand and make it violently impact the boards. It's grasping for straws to say that Tom Wilson did everything the DoPS asked for here. Just because he didn't leave his feet, or pick the head, or similar does not mean that Tom Wilson has done everything the DoPS asked for. The DoPS has asked for him to stop committing illegal penalties that result in significant injuries.
You can make the argument that you think Carlo was not defenseless. However, I think it's unreasonable to say that you are 100% sure that he was not defenseless, and I think it's unreasonable for anyone to say that the NHL is unreasonable to say that they think he was defenseless. I think there is some doubt in both opinions, but as a repeat offender and perhaps the most dangerous player in the league it is reasonable to say that Tom Wilson does not deserve the benefit of this doubt where other players in the league would deserve the benefit of this doubt. Hence, the comments by Elliotte Friedman's contacts around the league.
I think the reaction here that this was 100% clean and that the NHL f***ed up royally is just sour grapes whining and wholly unreasonable. If you think it should have only been a 2 game suspension, ok fine. I won't fully agree, but I get it. If you think he should have gotten 20+ games, ok fine. I won't fully agree but I get it.
But to say that he should have received nothing and that it was 100% clean is unreasonable, given his history, given the circumstances of the hit, and given the injury. And on the other hand if the NHL levied a 50+ game suspension I do not think that would have been a reasonable outcome either. 7 games is a perfectly reasonable suspension length given everything.