So effectively it would actually not be unpaid leave but it would be like a loan by the employees to help the company in a difficult time - a win win for both parties.
CX certainly doesn't need a 'loan' from its employees.
CX has excess pilots and is trying to reduce manhour costs. The difference to the bottom line is negligible but like any good business they must try and cut unnecessary costs - including paying too many people for too little work.