i do understand what you are saying but you are making my head hurt. i will stick with
MAPEGUM WPS
Fast drying flexible liquid tanking membrane for the interior waterproofing of bathroom and shower walls and floors before installing ceramic tiles and natural stone.
Ardex WPC Waterproof Protection System kit is used as a waterproof protection coat on backgrounds such as cement or gypsum plaster, plasterboard or wood based materials prior to fixing tiles in domestic bathrooms, commercial kitchens, showers and bathrooms. It can be used for sealing internal corners between walls, filling holes, joints and gaps round pipes, baths and showers prior to tiling.
BAL WP1 Waterproofing Kit is a flexible, seamless and complete waterproof tanking system. It comprises of an acrylic-based flexible WP1 tanking coating, WP1 polyester tape, WP1 polyester matting and APD acrylic primer. The BAL WP1 waterproofing kit provides total waterproof protection of substrates prior to fixing wall and floor tiles in wet or dry interior environments. It is recommended for use in showers, bathrooms, kitchens, laundry and utility rooms, upstands, pipes and floor wastes. It is even suitable for areas where movement may occur, such as drainage channels and junctions between walls and floors.
if you had a constant flow of water directly on to a tanking system then maybe you would be correct but with the amount of water that will come into contact with the tanking (non if the tiling is installed correctly) i think we can safely say the tanking is water proof.