I think this is an uncharitable reading of the purpose of Gaiman's quote. His quote isn't really meant to be a factual claim but an inspirational one.

Now obviously some people will find more inspiration from quotes that express a truth as compared with those that don't. Perhaps you're such a person (I suspect that many people on LW are). At risk of irony, however, it's best not to assume that everyone else is the same as you in that regards.

Evaluating something with an emotional purpose in accordance with its epistemic accuracy (instead of its psychological or poetic force) is likely to lead to an uncharitable reading of many quotes (and rather reinforces the straw vulcan stereotype of rationality).