I think the article is trying way too hard to attribute very small changes in performance to something that would be a fairly major shift in strategy (going from dump and chase to possession).
Minnesota's record last year is practically identical to their record through 48 games this year. Similar goal differential as well. Using them as the "proof" that possession is more effective than dump and chase is rather strange.
The other teams mentioned in the article have also not experienced any great difference in performance. Dallas is the same as last year, Nashville slightly improved, Washington slightly worse. And in fact, if Dallas, Nashville, and Minnesota all performed at a level similar to last year, we should expect a minor improvement due to having some games against weak Eastern opponents this year. We should expect a slightly worse standing for Washington for the same reason. The Preds and Caps have behaved as expected, while you could argue the Wild and Stars have in fact been slightly worse than last season.
There's really no basis for using the results of those four clubs as a ringing endorsement for any specific strategy. And that's before we consider any roster changes that took place as well, hardly a controlled experiment.