That's a power ranking not most improved. The Athletic, The Hockey News, stats geeks, AP, NHL, etc are not favorable to the Avs improvement in the offseason. It is pretty consistent though that New Jersey, Dallas, and Pittsburgh have had great offseasons on all of those.
Here's the stat geek that everyone likes to post:
His model has Avs at 98 points. IIRC Avs were 110+ last year on his model.
More or less most people have the Avs high in the rankings based on past results of the team and star power the Avs have. Not the moves they made making the team dramatically better.
One piece of revisionist history is going on here (in general, not specifically you) though. People are acting like last summer it was widespread that the Avs would have a trying season and the offseason was bad. It was actually the minority of people here screaming that. Most were expecting to contend for the Cup and that the West would be a breeze. The Avs were by far the best team and just needed to make a simple move or two. That was common here and posters who went against that were mocked for a while...
I mean to be fair most people expected Landeskog to be back in January and didn't plan for Nuke to disappear. Wouldn't surprise me if the Avs at least made the conference finals with those two in the line up. Not sure if they would've beat Vegas though.