I'm sorry. I don't see how you're not being delusional.
You don't have to be there to judge her preparation? The results of her preparation is a loss. You were not there. You are some how saying that it is still good preparation. You can't confirm there even was preparation. That's an argument from ignorance.
The measurement of a good coach in a competitive league, is winning, by everyone's standards. That's why you're googling it. It gives you the general sentiment for my statement.
You cannot say "their setups do work and have worked" if they are losing their games. That's a fact. You cannot be successful in anything if you're losing. You're being nonsensical.
I have shown you proof. Her win/loss record. There's not a single serious person who believes you cannot measure a professional coach by their win/loss record. You are measuring her performance based on your "feelings" which are not grounded in reality. Potter is losing games, her setups are not working and you're arguing she is some how a good coach. Nonsensical. period.