Modern wooden flooring is already very moisture-resistant, so there is no special need to raise it. The advantage of raising the floor is that it allows for leveling, not moisture resistance. Once
https://www.pelicorfloor.com/faq/does-wooden-flooring-need-to-be-raised-to-resist-moisture/
, the recommended minimum is at least 5 mm. Why? Because wooden flooring expands, and interior doors may also
https://www.pelicorfloor.com/faq/how-much-gap-under-the-door-is-recommended/