Astronomers See Evidence of Something Unexpected in the Universe

Or so you claim. The Imps would most likely have somebody "on the inside" to spread misinformation like this.

Unless I am missing the point General Relativity actually assumes that standard clocks and rulers don't exist and then makes predictions for what we should see here based on that.

Special Relativity posits that all inertial observers agree on the speed of light.General Relativity, lacking global inertial observers (i.e in general there are no inertial frames) doesn't even posit that. The speed of light will be observer dependent.

I don't know how much detail you want (actual calculations?), but if you shine light on a mirror above the event horizon of a black hole and time the return of the beam and the distance, you won't get the usual speed of light.

Yes indeed, the black hole is a dramatic exaggeration where it would be obvious to a human, but it'd be true above the Earth.For spherical gravitational fields the speed would be: where c is the usual speed with no gravity around and the speed in the presence of gravity. M the Mass of the body, G is Newton's Constant and r is the radius of the observer.For the case you mentioned that results in light being less than a m/s slower.Edited by Son Goku, : No reason given.