Those headlines are a bit sensationalist, I think.
First, his "traveling into the future" is simply a pretty lame way of describing what would happen if a person was to ride for an extended period on a spaceship that could travel close to the speed of light. That's pretty well known stuff, not crackpot theories.
As for the the show on aliens, I actually just watched it a few days back. Pretty interesting, and he makes a number of good points.
Scientific American had an article a while back that essentially said "the only reason humanity is where it is today, is because we're essentially galactic country bumkins, living in a solar system that is, relatively speaking, a LONG LONG way from much of anything interesting going on at all.
We're actually between two arms of the Milky way, with not much around us but open space. They theorized that if we were actually within one of the arms or worse, more toward the galactic center, cosmic collisions, extra radiation, etc, would be so prevalent, life would like never have had enough time to evolve to the point that at has here without getting wiped out by a comet or whatnot, and having to start all over again.
And the comparison between us and native americans when Columbus came around? I could easily see that. Consider our own view of an ant, or a cockroach. They aren't intelligent, can't communicate with us, and are tiny, so we stomp em and move on. An alien race that's built ships capable of intersteller travel would have to be +awfully+ compassionate to give a rats ass about race of beings like us, living on a backwater planet, having +only+ sent their people to their moon, and a few robots to their next planet over.
I remember a show (was it Twilight zone?) that made the comment, "we've been sending out all these messages in the form of TV and radio broadcasts for 70+ years now, having no idea who or what out there might be listening, or who's "screen" we might pop up on as a "system of interest".