actually, it might not be. it is something that has yet to be checked against the logs of commands used to spawn the mobs to confirm or refute. we have one EC on the one hand making statements about it saying only a few were spawned... but also saying she doesn't know how many in total and she was not the one present at the event... and on the other hand we have multiple eye witness accounts of numbers that add up to months worth of spawns. you can't claim positively that they weren't any more than he (or i) can claim that they were. only those logs can say for sure at this point.
HOWEVER, it really doesn't matter if they were or not anymore since the policies that allowed it have been looked into and revised to help prevent something like that occurring again.