From what I’ve previously read on this site and my own investigation, the roof space and ceiling are common property and so not your responsibility. As these were installed without permission (and no associated bylaw allocating whose responsibility maintenance is) it is the OC responsibility to comply with the fire regs and so it is up to them to make them safe.
They cannot just rip them out but they can restore the lighting (and plumbing) to it’s original state so that the property is still liveable. Maybe you could negotiate a compromise regarding costs that you will contribute to the work if you can have a say in the outcome.
BUT you would then have to register a new bylaw regarding these alteration and accept responsibility for it’s maintenance. Previous posters have indicated this could cost YOU $2,000 which to me is ludicrous but that’s the rules as I understand them.