Why is Calgary doing that?

Why is Winnipeg trading a defenseman when they have one of the best team defenses in the league?

Right idea but wrong execution. Lindholm for Chibrakov & 1st round pick. That's the value for a rental like him.

How about Winnipeg trades a first-round pick, and a couple of prospects in exchange for Elias Lindholm?
I don't see Nate Schmidt as a good acquisition for the Flames.

On paper this looks like a great deal for the Jets, but in reality they wouldn’t do it. Schmidt is a big part of our D and there is almost zero chance he gets moved before the offseason.

The almost universally accepted valuation is Lindholm for 1st + Lucius, unretained and no extension in place., but with Lucius injured, CGY might prefer a different prospect like Chibrikov, though because they won’t need him til next season, they may not.

Calgary has no interest in yet another small left shot winger. Chaz Lucius was acceptable because besides being a much better prospect he's a right shot center with decent size.