Sounds like pure BS to me. I too have a very high water table and get water under the IG pool. Fortunately for me my builder knew this would happen and built a large drywell under the deep end of the pool and tied it in with a separate feed line to my circulating pump. When water builds up I valve this line it to waste ( and close lines to and from pool) and just pump the water away. Have worked great for many years.