"Because every physical thing has a start."Does it?
Everything we know about the world is either due to observations or inferences from our observations. We have not observed what was at the start of the Big Bang, nor prior to it, so for all we know whatever that was was qualitatively different than what came after, and really did have no beginning.
"Some time-bending supreme being that creates time and existence itself can overcome that "start" because of it's super powers."
That's the claim.. but that claim seems to me to be no more convincing than saying "because magic" or "just because".. might as well say that about the "physical thing" at the start of the universe.
A being that creates time has its own additional problems besides.. such as how could there be anything before time? What does that even mean?