1987a has been thoroughly studied and the difference in time between the arrival of neutrinos and photons is understood. It should be noted that the author of this new theory is not an astrophysicist.
Nor was the author of my post, at one time a condensed matter theorist who makes no pretenses to expertness in cosmology. My comment did not deal with the origins of the discrepancy so much as the claims made that -- whatever their provenance -- these were potentially earth shattering discoveries.
Nope. Not.
As for the well-understoodness, is the delay accounted for entirely by the fact that it takes light from the core substantially longer to propagate to the surface than the weakly interacting neutrinos?