I guess he was talking about the kind of precision more specific to AI, which goes like "compared to the superintelligence space, the Friendly AI space is a tiny dot. We should aim precisely, at the first try, or else".

And because the problem is impossible to solve, you have to think precisely in the first place, or you won't be able to aim precisely at the first try. (Because whatever Skynet we build won't give us the shadow of a second chance).