Two years ago the liner shifted when we started filling our Intex. One leg was leaning badly, so we looped a tow strap around the tee and used an engine hoist to lift the post so we could reposition it.

Maybe if you could lift this post you could insert a paver underneath it to make things level.
 
That post definitely needs a paver or 2 under it. I'd say drain some water, pull the liner back and remove the cove and slide a couple pieces of wood in to hold the load (pool wall) and lift it enough so you can slide the pavers in under the post. These pools are heavy though. You will need some strong men to do this.
 
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