This statement is a farce. They claim the story is factually incorrect, but provide no corrections. They point out the NYT does the same thing, but that does not contradict anything in the NYT article, and has no bearing on what they did. Finally, they yell "debate me!" but rather than proposing a debate on the facts in dispute, instead want to debate federal tax policy which neither controls.
EDIT: and as you pointed out Fedex is just following fed tax policy that it doesn't control.