.....how does that explain ground effects on final?
Bernoullis' theorem does not explain lift, and never has. He simply stated that the sum of the energies in a gas remains constant.
We therefore derive that the sum of kinetic energy and static pressure energy remains constant.
When we add the equation of mass flow being constant in a tube (area, velocity and density) assuming incompressible flow , we are getting somewhere.
Ground effect simply arises because of a reduction in downwash, which is why low aspect ratio works well in ground effect.