No, for two reasons: 1) The idea is that we will do it, not that we have done it already. (How does something we will do in the future affect what we see today

No, for two reasons: 1) The idea is that we will do it, not that we have done it already. (How does something we will do in the future affect what we see today? It doesn't, at least not causally. It's just that some civilization had to be first in the neighboorhod, and that civilization will be the one to preempt the others, at least according to this model. So it's more of a probabilistic conditioning effect than a causal effect: conditional on existing, that means no one preempted us, which means we're the first, which means we'll preempt everyone else.) 2) The preemption happens well before the other civilizations come into existence. For example, we might deplete their stars of energy so that evolution doesn't happen at all on their planet.