An unpublished research report gives a new theory, called "undulatory propagation," to explain the result of the Michelson-Morley Experiment in a simple, logical way

Is there anything fundamentally wrong in this new theory? It seems to be much more logical than special relativity at explaining the Michelson-Morley Experiment.

Well, it's unpublished, appears on a personal website, claims that over a century of physics is wrong, and starts with Einstein's quote about great geniuses being suppressed by mediocrities.

"It does not contain mathematical gobbeldygook ..."

I think it's simply amazing that many anti-Einsteins use Electromagnetism to prove their claims that SR is wrong. It is the Maxwell equations that generated the concept of Lorentz invariance, which is effectively the basis for SR. If SR is not right then neither is Electromagnetism.