Seniority only works for the Company and weak pilots.
Interesting piece of nonsense.
An FO awaiting upgrade has to achieve a number of prerequisits. Sufficient hours, appropriate licence, suitability, including a satisfactory training and disciplinary record, pass a command assessment and, if a seniority based airline, have sufficient seniority, but all seniority does is give a pilot a go in their due turn, it certainly doesn't guarantee a pass.