> Neither Poincare nor Lorentz are relevant to the genesis of General Relativity

Well, that's just plain wrong. From the horse's mouth:

> As we know, this is connected with the relativity of the concepts of "simultaneity" and "shape of moving bodies." To fill this gap, I introduced the principle of the constancy of the velocity of light, which I borrowed from H. A. Lorentz's theory of the stationary luminiferous ether, and which, like the principle of relativity, contains a physical assumption that seemed to be justified only by the relevant experiments

More from here:

https://en.wikipedia.org/wiki/Relativity_priority_dispute