Re: Does the Federation still exist in the 31+th century?
Daniels was already influencing Archer in a somewhat inapporpriate manner as far as the influence on timelines is concerned. It makes sense for him to be as vague as possible in his conversations with Archer and to confine himself to only divulge details necessary to get Archer to do what it necessary. What Archer needed to know at this point was the fact that Sphere Builders were waging a larger-scale attack against the Alpha Quadrant in the future and that Xindis and humans will fight them together.
It would make sense for him to word his statements in such a way as not to blow Archer's mind.
"Now and then we had a hope that if we lived and were good, God would permit us to be pirates." Mark Twain, Life on the Mississippi