Constant? Not if you accept the actual measurements.
"Also, type 1A supernovas are pretty darn consistent, even for those at great distances where the light is just getting to us now, even though the speed of light when the supernova occurred was “exponentially” faster than it is today. It would NOT be as uniform as we’ve seen them today for objects both near and far."
Many scientists conflate 'light-year' as a measure of distance with 'light-year' as a measure of time by assuming a constant speed of light and don't explain that to the true believers. As a result, the true believers become confused and believe that something has been shown when it hasn't.
"But please, keep on avoiding my questions concerning “gravitational time dilation” that doesn’t actually exert any gravitational influence upon light."
Not my position. You're confused.
1) Please show me where the speed of light has changed in the last 50 years. I know you’ll cite differences based on available tech at the time prior than 50 years.
2) You never answered my question as to why a Type 1A supernova are pretty much uniform from location to location. Very rarely is anything different between them. Yet the speed of light when they occurred all varied WILDLY. EXPONENTIALLY so even.
3) The pat answer I usually get for the time/distance discrepancy is “gravitational time dilation”. AS if those three words actually answer anything. Since you replied to my post citing that, I tried to follow up with you. Since you don’t want to tackle that, then we’ll skip it.