I have listened to Jimmy’s podcast with Paul Bannerman and it seems like the owners corp is probably up for these repairs.
It’s David Bannerman (thanks for listening anyway) and it’s my recollection that David was saying if the common property in a bathroom hadn’t been renovated then it was the owner corportion’s responsibility, but if it had it was the lot owners’ reponsibility. The same may apply to balconies. If so, the new owner can maybe take it up with the person who sold them the flat.