[watershawl]

So I watched the whole thing and only understand parts of it, but is his main theory that the laws of physics which were previously thought to be unchanging may indeed change over time and that itself is the proof that the universe is temporal?

[liquidise]

That appears to be it. The talk struck me as a philosophical consideration on a traditionally young-earth-creationist viewpoint. The idea being that physical laws and constants, namely the speed of light, change over time.

While the scientific portion of the suggestion lacks merit, considering the hypotheticals is certainly interesting.