Perhaps "updated" wasn't the best choice of words, since RNP capability does describe a more recent standard than RNAV. My intention was to clarify that the AIP mention of RNP5 may be an out of date editing error, since Eurocontrol standards generally require RNAV5 rather than RNP5 capability for enroute controlled airspace - suggesting therefore that then GEN1.5 mention of RNAV5 was produced more recently than the RNP5 statements in ENR3.1. RNP5 is generally seen more operating outside Europe, eg across the Middle East.