You don't need the band members themselves to say "yes we're having this gig on this date", that's not how it worked before sites like facebook and twitter, and I don't even know if every band uses twitter to state things like this now. I think tour dates are always released at the same time as concert announcements though, but X are always slow with things and we have confirmation that official tour dates will be revealed very soon, coincidently just as these shows have been announced. I don't think there's anything to be suspicious about really.