Please get the physics right!

Einstein did not make the speed of light a constant a “law”.

It was an axiom or postulate of the theory of special relativity.

“The first postulate of special relativity is the idea that the laws of physics are the same and can be stated in their simplest form in all inertial frames of reference. The second postulate of special relativity is the idea that the speed of light c is a constant, independent of the relative motion of the source.”

This postulate has never been violated empirically.

One can only feel pity for anti-relativists.