But is that it? That's what everybody pegs Epicurus's dislike and distrust of poetry to?
Joshua's supplemental cites are good to add to the pot.. I think the Diogenes Laertius statement is the main cite as to Epicurus, and yes that is probably the main basis for the allegation, but there's definitely supportive commentary in Lucretius (and maybe others, but I can't recall specific cites).
It's almost as if they are including the poets as purveyors of supernatural religion, but that doesn't seem to be the exclusive basis.