As pilots are required by law not to operate when unfit due to sickness or fatigue then this policy is likely to end up in multiple cases taken for unfair dismissal. As they frequently tells their crew not to report when sick or fatigued and it’s clearly stated in their operation manual along with several other sources then to use it putatively is a non starter. Conduct like continuously late, pattern sickness or no shows yes but as there’s a policy to follow for all these it can’t be suddenly used. Only something on record as part of the disciplinary process can be used. It’s a tactic anyway devised to scare crew into operating as much as possible, even when sick. It will fail and crews will continue to abide by the ANO and their operations manual. Management have ample procedures available to pick out the trouble makers. Sad times that it’s comes to jeopardising safety for profit.