If you read a prediction from Nostradamus that doesn’t seem to match any event, you can say “well, it must not have happened yet”. You can’t do that with this prophesy, because the succession of popes since 1139 (or 1590) is a known quantity. This allows more interesting analysis, as you can score how well (or badly) each pope was “predicted”.
The question is does this prophecy take into account the years when there were two Popes, one in Rome and one in France. That went on for quite awhile.