One of the parents came from OZ So I could see either of the above 2 scenarios plausible in this plant.
Then it would be a buyssoniana. The Orchid Zone did not breed many phals, and most of their motherplants were from Herb Hager, who had a very special interest in buyssoniana and making tetraploids. ( They released too an excellent strain of phalaenopsis maculata and equestris, of whom exceedingly few plants are alive today).