Isn’t this kind of the same thing as saying the pump creates the pressure?
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Kinda, but no. The kinda is because it matters where you measure it. Sometimes they stress these definitions so you don’t get confused later. This sounds like they are clarifying the difference between the words “flow” and “pressure”, as much as “pump.”
Imagine a pump hooked up to nothing, so that the water just falls out onto the ground. That water is under almost zero pressure aside from, like, the atmosphere.
But, attach a 2″ dia. pipe to it, say 20 feet long. The pump is making water flow into the pipe, and if it’s pumping enough water to basically fill part of the pipe’s diameter, the water is under SOME pressure, because water closer to the pump has to move the other water along before it can flow. Resistance, see?
Now, say we angle the pump upward diagonally. That makes the water farther from the pump harder to move, so pressure in the pipe rises. Cap it off to a tiny hole, and pressure rises again.
Yes, the pump needs to generate pressure inside itself to make the fluid flow, BUT, no matter how hard a pump pumps, how much volume it moves, or how much flow it creates, once the fluid leaves the pump, there is only pressure if there is resistance.
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