My statement about "best" line-up has nothing to do with being an official. I've seen thousands of teams compete over the years. Ask any coach how many times they get their absolute "best" line-up on the mat during the course of a season. I guarantee you it is less than 50% of the time. Doesn't mean they don't want to, just means it is hard with 14 weight classes. Injuries, not cutting weight, in trouble at school or home, etc., etc. etc.. It's hard fielding your "best" team event after event.
You can't do any weight loss activities once weigh-ins begin. If kids are running/warming up when an official walks into the facility, shouldn't be a problem as long as they are not wearing "plastics", etc.. Book does not allow for quick weight loss aids like plastics, saunas, hot showers, etc.. But running in warm-ups prior to weigh-ins beginning is fine.
I think you are way overstating at 50%. I think that many teams have a kid missing here or there, but I think missing kid(s) 50% of the time is a little exaggerated. I think many teams have a complete line-up the majority of the time, and for a region match I would think a coach would do whatever possible to ensure his best line-up takes the mat. Besides, the op implied that very many kids missed weight which would dramatically affect their line-up and chances of winning. Now if she is incorrect in her accusations then her team got the result they deserved.
Regardless of the weigh-in outcome, I do not agree that just because 50% of teams can't field their best line-up that a coach who can should just accept it when he can't. I would also hope that all officials are fair and judicious following the rule book as I look upon an official as a judge in the truest definition of the term. I, personally, don't think an official should have such a skewed attitude. My opinion for what it is worth...
As for "Yoda speak" I thought the wording of your last sentence, "Most lively this...." was reminiscent of an early time in a message board galaxy far, far away where certain posters would take on names and speak as Star Wars characters. I especially miss the Darth Vomitus fellow as I personally found him entertaining.