You don't destroy a facility by bombing through concrete and exploding it. This isn't an action movie.
You overpressure the structure with a shockwave.
By targeting the vents, we've produced a 200m crater showing that the shockwave did violate the facilities containment. That place is gone.
This is the same sort of silly as "but they didn't blow up the reactors!" No, they intentionally avoided them to avoid throwing radiological material into civilian areas.
We can detect a pencil size rod of uranium from satellite and plane - because we've informed countries when they have had radiological leaks. If Iran moved any meaningful material (doubtful, uranium is hard to transport when enriched..) then the US knows where.