OC’s costs preparing for and attending mediation and the tribunal, if the matter escalates, will be billed to her.
The OC can’t just award themselves tribunal costs like this. In fact, if it goes to a tribunal and the OC loses, all other owners will be liable for the costs except the objecting owner.
Perhaps this owner could write to the chair and ask them why they are misrepresenting the facts and strata law in this way, and suggest the building might be better with someone else in charge who actually listens and doesn’t try to mislead owners with BS interpretations of the law.