I think the so called native teachers are Native English Speaking Teachers. The parents sheldom concern if the PTH teachers are native. However, up to now, there were 5 PTH teachers had taught my kid and I couldn't said if they were native or not. Some parents were so curious to find whether the teacher held a SAR passport or not at the airport.
I haven't spoken Mandarin to Principal Lau, to be honest, her Mandarin standard is not my concern. I understand that there is no guarantee regarding teacher's quality, however, if CKY claims they have 60% native teacher (written on the brochure) I do hope they really stick to this promise.