Feel free to correct me if I'm wrong, but...
Demidov, if everything goes well and I mean well is likely a 90-100 point winger. There's always a possibility if things go well, he goes even higher, but I feel like that's a fair assessment on his ceiling if everything Goss right.
For Lindstrom you're looking at a player at, or just above a ppg player, 35+ goals while adding a big, mean power forward with nice wheels.
Again, Lindstrom could hit and have things go very well and be a 50 goal scorer and over 100 points, but trying not to go too far.
So, it makes senses that teams, or at least the Habs would prefer Lindstrom over Demidov.