[Juliate]

A sum or product of human knowledge is not humanity: that specific mission (putting it into space for preservation or contact) has been done (Voyagers and others) and is done continuously (radiowaves).

Making a dent into making humans a multiplanetary species requires making a lot of companion species as well; the task requires much more elementary stuff (relative to the mission), at the ground level, than Musk is demonstrating to do (at technical, entrepreneurial and political level).

This is a con, from the start. It just worked so far so some people fall for it.