This is a depressing comment to me. Solving this problem is not just about "Math" and he explained it in the videos. The current math is based on a flawed premise, that time continues when there is no movement or change.
Ok, I'll bite. Name a single phenomena that behaves differently in this "timeless" model of reality. Surely, if the concept of time is such a flawed premise, there must be some way in which a timeless model produces better results in describing our reality.
I do not think you watched the videos, because this is directly addressed. Julian says Newtonian physics is fine but it has a limit. Nothing "behaves differently" in this timeless model, because nothing changes but our perception.
What would change though is the math.
Getting rid of time" in quantum equations would fundamentally change the way quantum mechanics is formulated, potentially requiring a complete rethinking of the theory, as it would involve removing the time variable from the Schrödinger equation.
If we understood them we wouldn't be looking this way