Assuming that Timmy and Diane are simulating a universe identical to their own, they will not succeed at changing their future relative to their simulation (alm

Assuming that Timmy and Diane are simulating a universe identical to their own, they will not succeed at changing their future relative to their simulation (almost by definition). One solution to this is that they never have the idea to try that in the first place. So one could argue the author has considered it ;)