They run dry sump engines, yates is referring to dry sump systems. They run 700 to 800hp and are running 70 to 80psi hot oil pressure if you information is correct. A hot street motor making 500hp would then need 50psi hot oil pressure, not going to get that with a stock pump and the kind of bearing clearances necessary to make that live. On dry sump late model and sprint motors I always adjust the pressue to 80psi hot, which is easy to adjust on dry sump systems. Wet sump is a different story, shimming the pressure spring or changing springs is necessary which requires pan removal and sometimes engine removal to remove the pan.
Oil volume through a bearing clearance at a given pressure is x, that about doubles with every .001 additional clearance. So if you are running .0015 main and rod bearing clearance a stock pump is fine for 40psi. If your running .0025 main and rod bearing clearance, then it won't work very long, you need almost 2x, and your max oil pressure will be lucky to hit 35psi.
You can't just say stock pumps are great for stock or mild motors, stock pumps are fine for tight clearance (.00125 - .0015) engines at mild HP levels. Anything else (HP or clearance) requires more volume and pressure IMO, although they go hand in hand.
If you take your crank to joe blow crank grinder and he always grinds them on the loose side so he doesn't have comebacks, your going to have low oil pressure with a stock pump I don't care how much HP it puts out.
In a wet sump system pressure is governed by bearing clearance and pump displacement volume and pressure spring. If the displacement volume is stock and the bearing clearance loose, you will never achieve the pressure spring relief valve to open IMO. If you have a HV displacemet volume and tight clearance, then the pressure spring relief valve will be open pumping oil back into the pan and costing you HP and heating the oil IMO.
IMO the proper statement of oil pump selection should be based on bearing clearances and actually checking them on assembly of the engine. It's absolutely necessary IMO to dictate bearing clearance to the machine shop prior to machine work being performed. Oil pump selection is then based on proper oil system (pan, pickup, pump) parameters, engine HP and rpm.
Oil selection also plays a big part of things. IMO a 5w30 oil lubricates better and has less entrained air in an oil system than heavier oils. My preference though and therefore my opinion.