Am I right in thinking this tournament is standalone and no crossover with World Cup qualification ?
In lieu of Andrew Pragnell being unavailable, yes you are correct.
OFC WC qualifying to start in the Sept window from memory, and be completed by March next year. So after the March Four Nation tourney in the UAE, will be 12 months of OFC games for the AWs. At least we will have the Olywhites at the Olympics.
https://www.stuff.co.nz/sport/350157331/all-whites-defend-oceania-nations-cup-after-all
The ONC (Nations Cup) winner no longer qualifies for the FIFA Confederations Cup finals or plays a part in Oceania World Cup qualifying, however, it is understood confederation finals rate higher than international friendlies in terms of FIFA ranking points.