Note - this isn’t over. There are other avenues by which the Commonwealth government can still cancel his visa. But doing that would be deliberate intent, rather than just the mess things have been up until now.
No doubt, they can do what they want, but at what cost. They lost in their own court, where they presumably have a great advantage. They already look like they acted in bad faith. They would hang a cloud over this year’s Open. And what message would they send to their own courts, etc.