Honestly your pool guys haven't any idea what they are talking about. There are two main ingredients in a paver sealer, solvent and acrylic. The solvent really is not important because it is just a carrier for the acrylic and it evaporates away. The acrylic is the most important part. This is what gives the pavers a shine and durability. The SuperSeal25
paver sealer is a styrene acrylic that has little tiny pin holes when dried. This does not create a 100% film forming membrane which would be like paint lying on top.
To etch a paver you would need an acid such as muriatic. You would never find that in a sealer.