That “rock ape” is possibly having to chrono 100+ players, many of whom have more than one gun to chrono. Having done that job at two different sites, you have to take some of what you are told on trust and assume that players have not dialed the hop up as far as it will go, which does leave the process open to abuse.
However, the key point is that the vast majority of sites only look at the velocity limit for the declared weight.
Random in game sampling including weighing of BBs is possibly the best approach and certainly provides a deterrent, especially when the penalty is to be sent home.
One of the things that I really like about AP is that they stick to what they say in the briefing. Unlike so many sites, they do not hesitate to send people home if they ignore warnings about hit taking, MED abuse and other poor behaviour.