That interpretation didn't even occur to me, possibly because I read the whole poem instead of the bit I quoted (and maybe I quoted the wrong bit). Here is the whole thing (it's short). I always feel a bit awkward arguing about how I interpreted a poem, so maybe this will resolve the issue?

(Incidentally, am I the only one mildly annoyed by how people seem to think of "rationality quotes" as "anti-deathism quotes"? The position may be rational, but it is not remotely related to rationality.)