Generally speaking, I think it is a serious concern whenever a manager receives this many complaints of emotional and verbal abuse because it exposes the employer to potential liability. At the very least, I think it would be a good idea for the school to document the reports, the school's actions in response, and provide counseling to the players and the coach.
More specifically as to these complaints, the following stood out to me:
1. 2015 incident during practice where the Coach forced players to head driven balls from 20m away without protection, notwithstanding player concerns, and 4 players suffered concussions during the practice.
2. Pressuring a player with an injury to give up her scholarship or get back on the field.
3. Disparaging remarks about a player’s relationship with her family.
4. Blowing up during individual meetings and telling a player “he’ll sign her transfer papers tomorrow” and “she won’t make it anywhere else”.
5. Pressuring a player to give up a scholarship by saying, “don’t bother training over the summer, you won’t be playing your senior year”, “if you come back, you’ll make things toxic”, and that “you are a financial disappointment”.