I do not think it necessary. Since coping in place, just add pavers.

what's the reasoning behind the expansion foam? And does the someone who recommended the foam work with pools or hardscapes?

Thanks

The paver contractor should provide a 1/2" gap behind the coping to allow for expansion. Usually the paver base is used and is sufficient. If no joint is provided, the pavers can move and damage the back of the coping during freeze thaw periods, I have seen this countless times. Foam can be installed to be used a guide to provide the proper space.

On concrete patios, a foam expansion material is installed prior to the pour. It provides a space between the concrete and the coping at a 1/2". The gap is then filled with a self-leveling polysulfide material and prevents moisture from entering. It has an elastic consistency and moves with the coping and concrete. The name brand we use is Deck-O-Seal.

If the polysulfide is not installed, water can get between and possibly get under the coping base and pop it off during freeze/thaw cycles. Can also lead to tile issues also on concrete pools.

I need an estimate of old concrete removed in new concrete replaced around my pool