@#8 ... They can't accept this might be more significant than their Trump obsession. ...
For me, quite the contrary.
My concern on this thread is the profit motive.
As you note, he's trying to sell a book.
That just demeans the scientific aspect of what he is proffering.
For the record, my current view is along the lines of...
We are likely not the only ones in the universe.
How do we know that there are not aliens among us already? I mean, if "they" have managed inter-stellar transport, might they already have managed to blend in?
Now, look at the multi-universe theory...
Multiverse
en.wikipedia.org
... The multiverse is the hypothetical set of all universes.[1][a] Together, these universes are presumed to comprise everything that exists: the entirety of space, time, matter, energy, information, and the physical laws and constants that describe them. The different universes within the multiverse are called "parallel universes", "flat universes", "other universes", "alternate universes", "multiple universes", "plane universes", "parent and child universes", "many universes", or "many worlds". One common assumption is that the multiverse is a "patchwork quilt of separate universes all bound by the same laws of physics."[2] ...
Give that a while to sink in.
What we do not know far exceeds what we do know.
Circling back, this guy seems to have a book to sell.
Not science.