Not all scientists rigorously adhere to the scientific method. That doesn’t invalidate it as part of a systematic method of discovery. Scientific inquiry is systematic even if not all scientists always adhere to any specific system. Astrologers have believed in their predictions for centuries and have made many efforts to confirm these predictions with data. During that time, there were arguments about whether it was a science. The system to make and test predictions was there. It’s well documented. However the predictions were not successful as those of Brahe, Kepler, Copernicus, Newton, etc., probably because living breathing humans and their behavior are too complex and unpredictable to be shoehorned into some deterministic equation.