What rights were violated? Who classified him an enemy combatant other than INGO theorists. What a tempest in a teapot. What does it have to do with Miranda?
I think Lindsey Graham and John McCain wanted him classifed as such, but I know of no such actual classification.
I don't know why someone in the DOJ was stupid enough to go tell the media "psst we aren't going to mirandize him".
Miranda is a funny little legal anomaly completely IMO without basis in the U.S. Constitution. Heck, go read Miranda; it does not claim the warning to to be a true constitutional precept. That doesn't happen until decades later when some U.S. Attorney tried to use the statutory exception that Congress had created.
Either way, there very well may have been a public safety exception actually present here but I don't really care because Miranda Warnings are IMO not a constitutional precept.
Best,
Joe