Snorkel Vault - Sump Pump

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So I have been lurking around here for some time...finally building a pool and have a few questions on stuff that I can't find in search.

I have a potentially high water table, so our builder (who has built quite a few pools in the area with lots of success) is recommending a "snorkle vault" under the pool that will help accumulate any ground water.

He says I really don't need a full time sump pump, because the "vault" will contain a tube that runs to the surface and IF the water gets super high the water will simply escape the top like a straw in a squeezed cup. He says I CAN add a pump, but really a portable pump for if/when you need to train the pool is all that is needed.

Sounds like he is doing a good job not to oversell me...but does anyone have an comments/thoughts on the above ?

Thanks in advance.