Based on it being a liquid formulation, that pretty much guarantees they're using Calcium chloride instead of Calcium sulphate.
They dont list the actual contents on the website when I checked just now, many remineralizers dont do this.
I suspect if people knew what the ingredients are and how easy and cheap they are to get, they would sell a lot less of this kind of "bespoke shrimp remineralizer".
This goes for many brands of GH and KH powders/solutions.
Are you having any issues with your shrimp currently, or what is the reason you are looking into this product?
You can easily make your own remineralizer with full control of the ingredients and for much cheaper.
Look into the IFC calculator if you havent already, it now has a remineralization module