Concerning the product waterproof floating vinyl plank or tile floor, it will not leak to the subfloor - by the same token, condensation from the concrete will not rise through the seams.

No! Quick answer, but vinyl is too thin for any kind of underlayment except ones specifically made for vinyl, which, of course are the more expensive kinds. If the underlayment is not made specifically for vinyl, it will be soft and compressable, which allows the vinyl to bend and move and lose all integrity of the seam lock.