Ballast resistor has nothing to do with the ECU but it need to match the coil's requirement and that may vary between a points and electronic setup.

Unless you have the old school 4 prong resistor in which case the second set of prongs is for the biasing resistor used by the power transistor. But that would not apply here.

My guess is that whomever wrote those instructions wasn't an electrical engineer and didn't notice that both the ballast and the coil need to be compatible.