Far more than I care to think about. Many times I have seen pools that were set in the ground and left empty just long enough for the walls to cave in. We dig the wall out, lay it on the concrete and pound it flat again.

Severe rust is the only reason I would replace a wall. Anything else can be flattened out or repaired.

If you feel, even after making the wall flat again, that it could still be a little weak in that area, you could reinforce the inside of the pool with 12” flat aluminum or metal flashing. Just insert it into the bottom rail inside the wall and tape into place.

Based only on what I have seen in your photo I think the wall is fine.

Best of luck, Dennis