This is an interesting point and one that physicists are aware of.
But from a technical perspective, the math is perfectly capable of describing theoretical universes where the laws of physics change in time or space. For example, where physical constants are smoothly evolving or manifolds that don't look the same in all directions.
The math can tell us what observations we'd expect in those situations, and so far we haven't observed anything to indicate we should relax those assumptions.
If we did observe that the laws of physics were changing, that observation would be considered science in the traditional sense. So it's not that "truth" is shifting, it's that "truth" is a family of equations indexed by some parameter rather than a single equation. That's a similar flavor to the jump from Newtonian physics to relativity.
But from a technical perspective, the math is perfectly capable of describing theoretical universes where the laws of physics change in time or space. For example, where physical constants are smoothly evolving or manifolds that don't look the same in all directions.
The math can tell us what observations we'd expect in those situations, and so far we haven't observed anything to indicate we should relax those assumptions.
If we did observe that the laws of physics were changing, that observation would be considered science in the traditional sense. So it's not that "truth" is shifting, it's that "truth" is a family of equations indexed by some parameter rather than a single equation. That's a similar flavor to the jump from Newtonian physics to relativity.
If you're interested in this topic, a relevant key word is "cosmological principle": https://en.wikipedia.org/wiki/Cosmological_principle