He brings in dark energy:
So why do we say we have a Universe that came from nothing? Because the value of dark energy may have been much higher in the distant past: before the hot Big Bang. A Universe with a very large amount of dark energy in it will behave identically to a Universe undergoing cosmic inflation. In order for inflation to end, that energy has to get converted into matter and radiation. The evidence strongly points to that happening some 13.8 billion years ago.
When it did, though, a small amount of dark energy remained behind. Why? Because the zero-point energy of the quantum fields in our Universe isn’t zero, but a finite, greater-than-zero value.
Ethan Siegel, “Ask Ethan: Can We Really Get A Universe From Nothing?” at Forbes
Well then, dark energy better exist or his theory is in trouble.
See also: What does “nothing” mean in physics? (Hugh Ross)
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