They thought oil in shale rock was “locked up” unti it wasn’t.
Never said that it couldn't be "unlocked."
(If, for example, sizable deposits of concrete were somehow discovered on the Moon's surface, Nasa scientists would be elated since it would be a - relatively - convenient source of water for future colonists. Of course, on Earth, it would be ridiculous to "mine" concrete - or some comparable natural mineral - for its water. The cost would be prohibitive by a factor of at least a thousand.)
But to say that this discovery (of a mineral in which water is "locked up" as in concrete) deep within the Earth somehow bolsters one's religious faith is rather disheartening. An almighty God would not require such a "handy" source. He could instead simply "whip it up," as needed - or "blink" it here from Alpha Centauri.
In contrast, extracting water from ringwoodite in order to inundate the Earth's surface, and then returning it, after the Flood, to deep within the Earth to be re-combined with the ringwoodite, all within a span of ca. 40 days... without totally disrupting Earth's geological strata in the process - that is all so convoluted a chain of events...
Feeling smug and self-satisfied because ringwoodite can be forced, with considerable contortions (requiring an abandonment of all principles of "economy of effort"), to explain where the water in the Biblical Story of the Flood came from... Quite unnecessary!
Regards,