the applications on that page do not require energy input
ie .. there is no force applied.

we are discussing proven methods here.

if you can use energy to displace water at the bottom
wthout exposing that energy to the water pressures.

then you can recover that energy as the buoyant force rises up through the water.

-1 + 1 = 0

now if the buoyancy is due to hydrogen gasses at the top of the water then you still have the energy in the hydrogen gasses to burn.

=1

3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.