TC - on the ekranoplane, the air between the fuselage and the ground/sea will speed up under the wing and reduce pressure rather than being squeezed to increase pressure. Once it has exhausted from under the wing it will slow down again and increase pressure back to static which will provide a barrier to the accelerated air coming off the top of the wing and reduce the downwash - if the downwash is reduced there is less drag and therefore more power available for thrust.
You can't 'squash' air unless it is constrained on all sides.
The CFS explanation of the ground cushion has always been a convenient way to explain what happens but never scientifically accurate - all that boll8cks about how a rough surface 'scatters' the air and reduces the 'cushion' never made sense.