Yes, without accent detection, the 'limericks' it finds can generally only be read with forced stresses, and the rhyming schemes it winds up with can be quite weak (rhyming an unstressed 'the' at the end of two lines, for example).

Ironically, by not knowing how to properly handle a stress-unstress syllable pair at the end of a line, this program would completely miscue on any limericks it finds with a first line that ends in 'Nantucket'