I cannot contest your hole drilling benefited your car. But how and what it did exactly to achieve that and whether it might actually on another's car do the same is unproven until tried and/or tested.
What actually might be happening in your case it might be allowing high pressure air at base of windshield to flow into the rear of scoop and then slowing the air entering the front and thereby reducing turbulence AND increasing ambient air pressure the carb sees, only as a guess.