I learnt "modular" (lesson by lesson) at RVAC in Morrabbin in 1987/88/89. There were about 8 or so people doing the same at the same time, and 6 or so all became professional airline pilots.
The "next wave" have about half that success, I think.
... so the idea that 90% plus would "make it" may have been a "true" statement for those who wnt through training at a previous time - but may not hold true for the people they are talking to at a later time...