If we are currently in S, then it is true that (a) our species will reach/surpass the posthuman stage before extinction (perhaps even preventing species extinct

If we are currently in S, then it is true that (a) our species will reach/surpass the posthuman stage before extinction (perhaps even preventing species extinction) and (b) our species [will likely] run a significant number of simulations (of which we likely, so it follows, are not the original biological implementation).