there is still a hard deadline for this: December 1st
If Lindholm isn't signed by then, he can't play for the remainder of the year, and this hurts both the ducks and Lindholm. On top of that, the longer the ducks wait, the more the AAV for this season is going to go up. Ducks only have several hundred thousand $ in cap space to play with, so even an AAV increase of $400k this season can make or break this for them.
Beyond that, The ducks need to sign him in order to start winning games, so yeah, there is definitely a deadline in play here.
Trust me, if the ducks wait, they are going to find themselves paying a FORTUNE to get a team to take on a $3M cap dump in Stoner (which is a small cap dump considering the cap ceiling--about 4%). They're going to find themselves in a VERY similar situation to the blackhawks where they're going to have to cut bait with a very good ROSTER player (not just a prospect) in order to make space for Lindholm--nobody is taking on Stoner as a favor.
There was also a SERIOUS lack of foresight on the ducks part. They could have had this space available without paying the price of a promising prospect for it if they had just bought out Bieksa and/or Stoner this offseason.
https://www.capfriendly.com/buyout_calculator/kevin-bieksa
https://www.capfriendly.com/buyout_calculator/clayton-stoner
That would have been $2.416M in dead cap space for 4 years, but for the following 2 seasons they would have had $4.833M NETTED in cap relief. That would have solved all of their problems. With their defensive depth, having young defenders in place to take on higher roles would have nullified the risk of the dead salary leftover
For Trouba, different situation, but same end result. It affects the team and the player (and the respective values of each component).