Ignoring your blatant bigotry in hiring, do you seriously think these rich businesses care about representation? All they care about is keeping the money flowing, while pitting regular people against each other so they don't fight against the system that keeps them down.
Hextall was hired because some board members at ESPN decided they needed some good PR when they joined up with the NHL. They ignored qualified job seekers and choose someone with no experience, over even experienced women. The answer why is obvious, they know she's a terrible broadcaster (is it debatable?) and that people will hate on her because of that. They can respond by saying it's sexism and put the heat on those who voiced their opinions. No loud voice would remain criticizing ESPN, but instead people cancelling other people. As long as people keep subscribing to the NHL network and leave the TV on during commercials through cable, there is no reason for ESPN to replace her.