Isn’t this kind of the same thing as saying the pump creates the pressure?
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A pump moves water. Ambient pressure causes water to enter the pump. The pump captures or spins a volume of water, and physically moves it to the outlet. If the outlet just dumps into a trough, then the outlet water has no pressure. However, if the outlet leads to a pipe, friction with the pipe causes water to resist moving, blocking the passage of water following. Because water is incompressible, this pressure reaches all the way back to the pump mechanism.
Either the pump is strong enough to keep moving water in-spite of this pressure, or it is not. Either way, the pressure’s source is friction of water moving within the pipe and not from the pump itself.
Think of a garden hose. Water exiting the hose has real no pressure until you press your finger over the end of the hose and create a restriction.
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