I just don't see how a school program can control weight loss other than by enforcing the rules and what the kids can wear to practice in. Diet and other weigh loss methods come back to the parents and the individual wrestlers, unless the kids are moving in with the coach during the season. I played the yoyo game in high school, 134 to 119 every week, and it did take all the enjoyment out of my senior year, and I was so burned out by regional I sadly didn't care if I won or lost. But my coaches had nothing to do with it, and my parents didn't understand the sport enough to stop me. While I don't necessarily agree with the number, if the 1.5% is enforced during the practice week then the "yoyo" methodology would not even be a player.
I now have a son who wrestles and I manage my sons weight loss and provide him a diet and the other tools (stationary bike, treadmill, running shoes) to facilitate losing weight if that is what he feels he needs to do. But I don't lock him from the refrigerator either, he has to have the will power and fortitude to do it, if he wants to eat and still make weight I explain to him the additional exercise he will need to do (calories in vs calories used). No short cuts, no saunas, no plastic suites, no water loss to make weight, we have a hot tub but he is not allowed to use it except to alleviate soreness and only for 15 minutes. I have a set of calipers and I measure his body fat, 7% is the rule, so 7% is what we go by. We don't even talk about pounds until the days just prior to getting on the scales. He grew 5 inches this year and it definitely had an affect on his weight, but he stayed around 7% and went up 2 weight classes (much to his dismay and many arguments from him about wanting to stay in the lower class). Not saying this is for everyone, but I wish I would have done it this way.