Probably the most interesting example of this is SN Refsdal, which made its appearance in 2014. This observation featured a gravitationally lensed supernova which simultaneously displayed images of different stages of the event. By analyzing the foreground lens galaxy, astronomers were able to predict the time and place of a subsequent appearance.
This improved accuracy allows us to estimate when the Refsdal SN will appear within the other lensed images of the spiral galaxy to an accuracy of ∼7 per cent. … it will be at the same phase as it was when it was originally discovered, offering a unique opportunity to study the early phases of this SN and to examine the consistency of the mass model and the cosmological model that have an impact on the time delay prediction.
Veratasium has a nice YouTube featuring this supernova.
That images of this event arrived at different times, however, does not in iteself immediately falsify Lisle’s ASC. His response seems to be that the light which is gravitationally lensed was initially emitted and traveled at an angle, before it was bent and subsequently picked up the pace and propagated at infinite speed direct to the observer. He maintains that the off axis travel portion would represent slower than infinity light speed. I cannot say If he has actually run the numbers with the distances and angles involved, but it does highlight an ambiguity in his theory. It seems to superimpose a Euclidean flat geometry to the actual curved universe that is shaped by mass and energy, as is described by general relativity and actually responsible for the gravitational lensing by the foreground galaxies.
In lisle’s equation, θ = 0 indicates the direction directly toward the observer, but what is direct? General relativity predicts light will travel in a straight line as determined by the curvature of space itself. Thus we say that light bends even though it is straight just as we say the sun sets even though it is stationary. Like the bendy looking routes taken by airlines, the path of light is actually a straight path on a geodesic. I would ask Lisle what he means by direct to the observer?