I had that thought. But upon further reading and re-reading and re-re-reading ...

... they do explicitly claim (at least) being part of a "whole":

  "If conditions on this Earth ever become harsh enough to cause our demise, you yourselves will long since have gone from this Earth.

  Nonetheless, and be that as it may, this does not mean that the fate of all humanity is not in the balance.

  Clearly it is.

  And that, of course, includes us.

  The world is one family.

  To this family we have given warnings before."

But they do claim more of a "functional", de facto, separation. In that, they are unarguably correct.-