You do have problems with reading comprehension. Mr. Every is a MacEvangelist, not an objective reporter.
As to the article, it summarizes what I knew from observing the events as a non-Mac user at the time... and he cites sources who WERE THERE... both at PARC and later at Apple.
The piece is pure propaganda because it implies Xerox was happy with Apple taking the GUI and was even complaisant - which is complete and total MacMythology. Every the MacEvangelist failed to even mention Xerox sued Apple over what Xerox believed was Apple stealing their GUI. It really does not matter how the judge ruled - the point is how Xerox felt about Apple activities related to their GUI.
HINT: Xerox sued Apple - they did not sue Microsoft.
And they did it only after Apple came up with the idea of suing over a GUI. I doubt the suit would have happened were it not for Apple's suit.