Maybe he has been vaguely assuming that bodies don't matter because the chosen ones will be giving theirs up anyhow. But of course, in reality, since one does not know when or whether the technological singularity (or whatever) will come, the wisest strategy seems to be to maximize health at all times, including the present, so as to maximize one's chance of living long enough to see one's preferred utopia arise, and to maximize as well one's ability to respond gracefully (i.e., without the awful baggage of diabetes etc.) to whatever does happen. I guess he just hasn't thought through that sort of thing.