Yes I agree with kaindub. It’s not really a question of whether or not they can present what you believe to be a false case to the other owners (and it may well be). If you are going to the Tribunal and you have a valid case, then you can use what they presented to the owners as part of your case.
From what you say it sounds like you have grounds for requiring the rectification works, unless I am missing something on the insurance side.