That's not the limit break fight, that's unlocking the weapon skill merit category.

The LB fight is indeed a BCNM. Perhaps you totally missed [url=http://forum.square-enix.com/ffxi/threads/17544-Since-no-one-seems-to-have-posted-yet-Final-LB-fight]this thread[/quote] currently at the top of the test server feedback forum?

If you used the moogle GM to raise your levels to 99,you cannot do the limit break quest.