Well if one had been aiming "haphazardly" then it's a good bet that any structured method would be an improvement.Perhaps to the haphazard way you might have been aiming. One more CTE thing I find bothersome is as far as I can tell it requires cinching every shot in a very constricting way. There seems to be very little leeway for independent speed, and shot precision ie. the various ratios of shot dynamics that would come up during the course of a game. Correct?
However, of one had been aiming using gb for example and they were quite clear about which shots they were inconsistent on and then they tried cte or some other method and saw immediate and significant improvement then it's a good bet that the method is the reason they were able to realize that improvement.