Well, for a start, they have altered common property without a by-law assigning future repair and maintenance to the lot owners.
I wouldn’t be seeking confidentiality. I’d be telling them they need to fix this, apply for retrospective permission and pay the bills or you will be standing up at the next AGM and giving the other owners chapter and verse about how strata law has been breached and they have been ripped off.
Give them the chance to put things right first – if they refuse, release the hounds!