This is a very serious issue. In other countries you could take the company to court for unfair dismissal, but not in Hong Kong. In Hong Kong anyone can be dismissed for no reason as long as that person is given their written notice and any allowances they are due. If the reason is an unfair one they just do not declare a reason.
It is important that CX pilots either have a proper stirke or back off completely. Pussy footing around will only play in to managements hands as they can cherrypick their sackings, as they have in fact just done.