The probability that players are being told something that you are not being told is very small. The probability that you are not being told of every change is considerably larger.
It is entirely possible to detect that a change has been made, to a high degree of probability, by collecting a statistically significant set of numbers.
I'm not talking about the precision or forgiveness numbers associated with various pieces of equipment. Those will definitely, numerically, lead to the occasional WTF shot and a number of lesser bad shots. I'm talking about longer term changes that will inevitably become apparent when a suitably large number of measurements reveal a significant change in mean values.
This is not the place to discuss statistics: I know plenty of statisticians who don't understand what they think they know. The fact remains that a large collection of numbers often reveals trends with a high degree of probability (but never certainty).
Dinking with sweet spots or gusts or anything else will inevitably show up if the variations persist for long enough. Thank goodness. Otherwise, one couldn't control the quality of a product without paying to measure every single instance of every single part.