When you watch the entire clip and take into account Tortorella's body language and tone, I don't think you can really say he was "ripping" into Duclair, unless you believe that criticizing someone's faults and pointing out the areas where they need to improve counts as ripping. Tortorella didn't bring up Duclair out of the blue. He was asked a very specific question by a reporter who wanted to know if he felt Duclair's poor on-ice performance came from lack of understanding or stubbornness. So basically before he even opened his mouth, he had been maneuvered into a corner by the reporter. This isn't to say that he absolutely had to pick one of those two options. If he was a more skilled PR person, Tortella probably could have produced an answer that didn't commit to either option. In a way, by saying "I don't know," he kind of did. To be honest I would rather my boss told people I was incompetent in some area of my job than tell them I was too stubborn to get with the program, since the latter implies you just don't care, or are too arrogant to change.
Tortorella went to great lengths to point out that going through the learning process with players is part of his job, and that it's something he enjoys. Basu's tweets also don't make clear that the last passage he quoted occurred three minutes after the end of Tortorella's previous comments on Duclair. In the intervening minutes he discussed a couple other subjects and then a reporter asked another question about Duclair.