Assume we don't value worlds other than those that diverge from the current one, or at least that we care mainly about that one, and that we care more about worlds or people in proportion to their similarity to ours.

But I care about the real world. If this world is just a hypothetical, why should I care about it? Also, the real me, in the real world, is very very similar to the hypothetical me. Out of over nine thousand days, there are only a few different ones.

As a second goal, we need to make this set of worlds have a higher utility than the others, so that if he does finish contemplating, he'll decide in favour of ours.

Because I care about the real world, I want the best outcome for it, which is that Eliezer keeps Roko's post. I'll lose the last few days, but that's okay: I'll just "pop" back to a couple days ago.

Note that if Eliezer does decide to delete the post in the real world, we'll still "pop" back as the hypothetical ends, and then re-live the last few days, possibly with some slight changes that Eliezer didn't contemplate in his hypothetical.