[danbruc]

I think you both essentially agree. The sentence you quoted makes no sense in a world without free will but that is probably just an unintentional small mistake by the author because we are so used to assuming we have free will in our everyday life even if we actually believe we don't. The sentence just tries to say what we should do (assuming we had the free will to do so) if we discovered that there is no free will in our universe (which of course is contradictory). You could (probably) get rid of the contradiction if you understand the sentence as someone in a universe with free will talking about making changes to a universe without free will from the outside, like a god fixing an issue in one of his universes to make it more consistent.