As said by others, the document talks about the RNAV (GNSS) approaches:
"This AMC provides an acceptable means that can be used to obtain airworthiness approval... ...in order to conduct RNP Approach (RNP APCH) operations. RNP APCH procedures are characterised by existing charted RNAV (GNSS) approach procedures...."
It's confusing but approaches charted as "RNAV (GNSS)" approaches are called RNP APCH.