That's not slightly skewed. A few inches is slightly skewed.

The PB should have taken the time to make sure the pool was square to the house.

We have done this multiple times and ALWAYS double and triple check our layout.

We have special laser that shoots 90 degree corners to aid in this set up. Just did this a few days ago on a layout for a new pool. We will verify with tape measures using pythagorean theorem. Yes, there's math involved.

You can curve the edge of the patio and perhaps install plants in a curved planter bed to disguise the imperfection.

IMo too late now to realign so use colorful stuff on the pool are to take your eye away from this . Did you not notice this when the hole was dug.

The general way to disguise a misalignment is to provide an assymetrical feature for the eye to be drawn to. Plant a tree in the angle farthest from the out or a trinagle shaped garden in the closer bit.