In the trisvabhava theory, is the consummate nature inflected by past present and future conditions? Or is it always the same and independent of causal conditions?
Yes consummate nature is inflected by past present and future conditions but it is not inflected by time. Do any other mahayana object? If something is composed of multiple parts and one of those parts is timeless and not inflected by time. Then the whole cannot be inflected by time even if it is composed of another part that is inflected by karma (including past present and future conditions). My advice: become enlightened and try to prove whether or not you are existing in reality as we know it, or not.