Just waxing philosophical for a moment:
What if we take anyone that says "Einstein believed xxx" and throw away everything and anything they corroborate their beliefs with. In the case of Goldberg, what are we left with?
Aether theory, Cartesian space, Time as a sequence of events, a single universe, Newtonian physics, common sense, and humans evolving as animals in a complex environment developing science and aircraft and radar (and subsequently stealth technology) all on their lonesome, but being possibly watched and visited by other civilizations.
In other words, how simple can we make the universe if we eliminate all the things that we "don't understand" as per the fast-talkers like Goldberg, Sagan, Hawking(no puns please), and Corso, and we simply assume that there are very intelligent human beings doing very intelligent things to bring us the conveniences we already have?
From there, let's assume there are possibly conspiracies of control over information along with a general apathy toward Science and complex subjects by the public.
In this universe, there are still many places to look for missing information, conspiracies of ignorance and of malice, deceit, and ineptitude. We don't need to look in complex mathematics and complex multiuniverses or time travelers in order to find things we need to understand better.
It seems to me that whenever the scientific world comes close to simplifying things or the government seems on the verge of disclosing secrets, these time-travelers and hyperdimensional snakeoil salesmen come crawling out on the airwaves again, reinforcing the Public's dysfunctional perceptions of quantum theory (the observer affecting the experiment thing, which should be the measurement affecting the experiment) Relativity and light speed and the 'impossibilities' it doesn't suggest except going back to the measurement thing again...
Anyway, I agree with everyone else: bogus, too much shoving going on and little real science understood by the talker, as he never stops to check and see if his audience is keeping up with him, because he doesn't really care if you understand him, since he knows it's bullshit. Lots of vague referrals to scientists and their universities (soandso from "princeton" etc.), lots of specific dates and things that nobody should know or need to remember, and if so, put it in a paper and run it up the flagpole to see what happens.
Why don't the time travellers ever tell us when the stock market is going to crash? Simple things like that could save more lives (and the future). Also, the many universe thing doesn't ever work with time travel. Why? Because if you go to another universe to travel through time, then how can it affect the universe you are IN? If there are infinite universes, then an infinite number of time travellers would be constantly travelling around re-adjusting everything back and forth and the universe wouldn't exist.
There really aren't any paradoxes in nature, only our perceptions of them.