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A non-reflective coating on the satellites will not stop them from blocking the light from astronomical objects.

The concern astronomers raised was blooming caused by oversaturating their sensors, not blockage.

The visor satellites are supposed to be invisible to the naked eye. They're still orbit raising, so we don't have results yet.

Do they plan to retrofit the coating on the +500 deployed?

Are there regulations that prevent future constellations from Amazon or Facebook, or any other giant, to implement albedo reduction on their constellations?

Those won't be up forever. They're all in a decaying orbit. They will get replaced in about 5 years.

As has been stated many, many times, the satellites are in very low orbit and naturally degrade over time to burn up in the atmosphere. The ones in the first batches that do not have a shade will only be up for a few years (5 at most).