I never heard of direct injection above the valve. Direct injection has always been in-cylinder nozzles at extremely high pressures. Port injection, as used on sprint car engines generally have the nozzles entering the port from the exhaust side of the head, straight into the bowl. Other than the clarification, I think you/ he is spot-on. The higher the rpm range, the farther away from the intake valve the injector should be. F1 engines live life way above 10,000 rpm. They have had injectors at great distances for years.