Granted he is "a bit" abrasive, but between the ebook and his many posts, he does go into more detail and clarifies many of the things he says, albeit in spurts.  He's also not the only one who believes that Tesla got it mostly right and Einstein got it mostly wrong.  There are many other videos up there that seems to revolve around similar premises as well.  

Further fueling these questions, I just came across this today:

http://www.popularmechanics.com/space/a24076/neutron-star-particles-spring-into-existence/
http://www.sciencealert.com/we-just-got-the-first-real-evidence-of-a-strange-quantum-distortion-in-empty-space
>Called vacuum birefringence, this bizarre phenomenon was first predicted back in the 1930s, but had only ever been observed on the atomic scale. Now scientists have finally seen it occur in nature, and it goes against everything that Newton and Einstein had mapped out.
>The theories of QED suggest that the universe is full of "virtual particles," which are not really particles at all. They are fluctuations in quantum fields that have most of the same properties as particles, except they appear and vanish all the time.

Between fake virtual particles that magically appear and disappear, and observations that go against everything Einstein mapped out, it does sound pretty nonsensical.  However, this video does seem a bit closer to explaining what may really be going on here:

https://www.youtube.com/watch?v=mLG4RbIt5yY 

Again, I definitely don't claim any expertise here.  However, something definitely seems to be amiss here, possibly even more preposterous than the idea of "man-made climate change".  As a final note, I will include this interesting TEDx video describing variance in the speed of light and other strange anomalies:

https://youtu.be/1TerTgDEgUE?t=635