It used to be that when observations didn't match predictions, the base theory was potentially falsified, but in cosmology it's allowed to just keep adding patches, like epicycles. Consider that epicycles were actually brilliant math, as a model of our view of the cosmos, but the crystalline spheres were lousy physics, as explanation.

Before Inflation, Dark Matter and Dark Energy, the original patch was when they realized that cosmic redshift increases with distance in all directions, so either we are at the exact center of the universe, there was some "tired light" issue, or other optical effect, or...

Then it was decided that space itself must be expanding, because relativistic spacetime!

Which totally ignores the basic requirement that measures of distance and duration dilate equally, in order for the speed of light to always be measured as C.

Such that if space were to relativistically expand, the speed of light would have to increase, in order to remain Constant. Yet that would negate it creating redshift.

So two metrics of space are being derived from he same intergalactic light. One based on the speed and one based on the spectrum. In Avi's description, the ladybug and the balloon.

Given the speed is still being used as the denominator, or it would be a "tired light" theory, the problem still exists. That doesn't mean astronomers will concede though. The next patch will essentially argue the edge of the universe is mirrored. That as the clock goes to zero, the ruler goes to infinity and so we will keep seeing ever more galaxies.

There is another way that light does redshift over distance and that is as multi spectrum "packets," because the higher frequencies dissipate faster. Yet that would mean the quantification of light is a function of its absorption and detection, rather than fundamental to the light itself. So we are sampling the entire wave front, not seeing those individual, single spectrum photons that have traveled billions of lightyears. Which would blow a large hole in particle physics and that can't happen.