Hi, the damage does not look too bad, but I would fix it before installing a new liner. Since you are installing a new liner I would use a rubber mallet and small piece of 2 x 4 to flatten out the wall. I would then use a laser level to check the level at every upright, make them all the same. The ground froze and raised up causing the wall to crease, you need to fix that. A crease at the bottom causes the wall to be short at the top, causing problems with staying in the top connectors.
Anyway, before installing a new liner, make the pool look like new.
Dennis
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