Sure, it matches some observations, it would be pretty useless if it did not, but it has to match all of them. But my point with the use of tired light is that

Sure, it matches some observations, it would be pretty useless if it did not, but it has to match all of them. But my point with the use of tired light is that there seems to not even be a workable theory how this could work. The idea is that light loses energy as it travels through space and therefore shifts towards red, but nobody can say how this would work. An early but immediately discarded idea was that light bumps into matter on its way and loses energy in those interactions, but that does not work because it would make everything look blurry as light scatters in all directions due to those interactions. As far as I can tell from a few minutes of reading, nothing was ever proposed that could work and matches with observations. But the CCC+TL paper ignores that, assumes that TL is true, and works from there.