I thought that Einstein showed why "it happened long ago" and "it happens when we see it" are wrong? If the light strikes somewhere else and the effect of that

I thought that Einstein showed why "it happened long ago" and "it happens when we see it" are wrong? If the light strikes somewhere else and the effect of that changes the interaction between us and it then we have to admit that both places perceived the event relative to themselves - the origin and or perspective are not privileged... So if Jupiter is peterbed and earth is peterbed by the same event to make the sums for the future interacton of earth and Jupiter work we have to consider the events relative to both Jupiter and earth's frame of reference?