I agree. I dont know what this dude was thinking. I think he was just going with his own personal theorem after a few winesI don't know who you got this off, but it is totally contrary to standard Physics opinion.
This forms the entirety of the disagreements with the basic premise of this thread!
All studies and experiments that have looked for changes in the speed of light have failed to find any variation.
the speed of light is most definitely invariant
If it is not, then Einstein's famous theorems are wrong,
and most of the physics of the past century will have to be thrown away.