The only undetermined system I can see is the one describing your views here. Can you spell out, simply and clearly, what you think is wrong and why? You seem to be setting up a strawman argument by claiming that the Hipparcos mission measureds deflection in a way that they did not. And, as has been said, your cryptic responses don't help.
I think it may be you who is not looking at the bigger picture, instead focusing on an incorrect mental model of how these measurements are made and what that means for cosmology. GR, including the bending of light rays, has far more evidence than just these measurements.