Her record is meaningless to the conversation.
There are limited facts in the story so it seems to me that there are two probable scenarios:
1) She didn't do the leg work to communicate clearly her approach and get the support of the school so was left to contend with a messy situation without the backup of the AD.
2) She isn't very tough and just folded under the hassle of a couple of unhappy parents.
Either way that means she has some accountability as do the parents.
This is one of those fault lines that you can see in society - and a lack of understanding of who we are and our own history.
One side is "It's the end of the world that our kids are rotten spoiled brats and this just proves it"
The other is "Things change - almost always for the better - and that the days of HS coaches being dictators was incorrect and needs to end. They need to deal with that reality."
I think the truth is probably in the middle but closer to the 2nd view than the first.
Almost 250 years ago those spoiled rotten Americans thought they could run their own country better than the dictator in England. That guy had a pretty good winning pct. as well and won the first truly World War. So people like Jefferson, Washington and Adams were nothing but helicopter parents acting in their own selfish interest and dragged the entire world into war. Jefferson made a halfway decent argument for why we did it in the Declaration of Independence and the world is almost surely better for it.
So these parents are nothing more than Americans doing what we always do. We fight for what is in our own best interest. We don't win every battle - but anyone worth their salt that calls themselves American is always there ready to fight it.
Apparently this coach was willing to surrender the fight and the parents won this round. There are 100's of other posts on this site of unhappy parents losing this same battle because the coach stands their ground or did the leg work to head off the problem. It is the ebb and flow of change and it is a good thing.