In summary, Einstein states that the ##c## is not an invariant in GR, and that from (70) and (73), it stems that $$\gamma = \sqrt{ -\frac {g_{44}}{g_{22}} }, $$ where ##\gamma## is ##|c| <= 1## (in relativistic units), and =1 in a Lorentz frame when ##g_{44} = -1## and ##g_{22} = 1##. Then Einstein proceed to compute the light ray curvature using the partial derivative of ##\gamma##. Questions:If the computed |c| in a frame subjected to gravity is generally <=
The OP's questions have been answered, repeatedly. Further repetition of the same misunderstandings and the same responses to them is pointless. Thread closed.