None of that means the "probe" wasn't intended to destroy mankind. Its mission was a failure, that much every Xindi agrees on. But none of them directly refer to it as a test; it's only the "Proving Ground" hardware that is being used for test purposes.
Memory Alpha seems to take the Future Guy at face value about the nature of the first Xindi attack.
I never mentioned Memory Alpha. As I said before, I just finished watching season 3. If you get time, watch it again yourself and see if you still feel the same way.