Seems like a couple of different conversations going on. One question was do APDs fail people to retain them. Another is, would an airline have and use a training syllabus that is insufficient for some new hires to be able to succeed with without any unsats.
I don’t believe any APDs unsat people who should sat, if anything they sat people who should have been unsat, and then news spreads for what went wrong on a ride and the pilot still received a Sat. That modified expectations of future students.
I recently told an FO that he should not take a job at Atlas that he was offered. Being offered the job does not mean you will succeed in training without a blemish. His RJ energy management that I saw didn’t seem anywhere close to what it would take to operate a 747. He had so much pride that he scored the job offer that he wanted to disregard what I was trying to say to him.