A nice scientific discovery, but utterly inapplicable to today’s water issues. Anything 640km down is far into the mantle i.e. well into the zone of molten or near-molten rock. That depth is actually the approximate boundary of the lower mantle.
And I actually surmise that there are miles of solid gold serving as the base structure for this molecular water. I need some grant money to figger this out fersure. Good Grief!