Sabine Hossenfelder: "The speed of light in a medium is also no longer observer-independent – as the speed of light in vacuum is" http://backreaction.blogspot.com/2020/12/well-actually-10-physics-answers.html

Sabine clearly sees that the speed of light in vacuum is OBSERVER-DEPENDENT https://youtube.com/watch?v=bg7O4rtlwEE but believes it is independent:

Ignatius of Loyola: "We should always be prepared so as never to err to believe that what I see as white is black, if the hierarchical Church defines it thus."

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Pentcho Valev

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