You seem to be mis-understanding what Tipler's assumption is. The Majority of Modern Physicist refuse to acknowledge the result of their own best tested theories if the result involves any mathematical singularities, or if they cannot renormalize the differential equations. They look at this as the 'math breaking down' or will just disregard the result at that point as a "to be figured out later".
Tipler does not do this.
He looks at Einsteins General Theory of Relativity and accepts the math for what it is. I.E. that the mathematical singularities do exist. The natural result of this is the Quantum Theory of Gravity developed by DeWitt-Feynman-Weinberg. However, this was abandoned as the Differential Equations were unable to be renormalized and thus you had infinite terms. Yet, Professor Tipler does not have problems with this. You see, he accepts that there will be these unknowables in the Physics, because the math is clear on what they are: GOD.
James R Redford's posts and Tipler's books go into this much better than I ever could, but just remember, your argument against Tipler above is an Argument against the known laws of Physics. I.E. you may not understand the fight you are getting in -- which is simply that some physicist refuse to acknowledge the existence of God, even if it means they need to abandon their best tested Theories.
Sabrine Hossenfelder discusses Quantum Gravity (Theory of Everything), it's comeback and it's issue:
https://www.quantamagazine.org/why-an-old-theory-of-everything-is-gaining-new-life-20180108/
