I'm pretty shocked that this happened, but that shock is also why I'm skeptical. Champa has seen our universe kicking his universe's ass in a 1-on-1 and in a team battle., and the fact that he sent Hit to make sure he doesn't screw up makes me think its really important and a serious offer. I don't think Hit has ever told a lie to us, either. What I think is happening is that this is a plot upon a series of plots. If I were Champa, and I knew that my team was sure to fall at some point in the Tournament of Power, either against U7 or a combination of other universes, I'd convince stronger universes to put the heat on U7 and pick off the weaker ones while having a non-aggression pact with U7, increasing the chances of having the upper hand with my team being fresher than U7's.