Generally speaking, balconies are common property as are the original tiles attached to them. What has happened to other balconies is irrelevant.
The question here is whether the balcony tiles in question were damaged by a fault in common property or the actions of tenants. In the first instance the owners corp is obliged to repair or replace. In the latter case, the lot owner should be pursued for allowing common property to be damaged.
If the OC think the lot owner’s tenants were at fault and think they can prove that, I would advise them to tell the lot owner to go ahead and take them to NCAT.