so you agree that the water pressure will drop at the bottom.
and it will continue to drop if you keep putting more of a vacuum at the top.

and the pressure will continue to drop even to the point that
there is little or no water pressure pressing down on the bottom
of the pipes cap if you keep applying more vacuum.

so that the pressure guage at the bottom will not read any pressure.

none.
zero.

the water still has weight and the pipe itself along with the water in it still weighs the same minus the weight of the air that was pumped out.

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