@Nepia Nope, it has been reported that there is an agreement not to pick ABs/Wallabies eligible players from MP. Obviously, it only applies to players who are actually eligible to play for the Pacific Islands, not players who are still in their stand-down period of 3 years if they are already NZ/OZ capped and want to change country, or players who can not qualify for the Islands, because they have no (grand)parents born in the Islands and can't meet the residency requirement either (like McClutchie).
So, in the case of Levi Aumua, it would be against the agreement to name him in the All Blacks XV, because he's under contract with MP for 2023.
By the way, it has also been reported that MP can sign up to 20% of players that are not eligible for the Islands, but despite that, there was some opposition when they signed McClutchie, because he's not Island eligible.
I'd love to know what is actually in players' contracts. Do they have to sign a clause in which they declare for their country of birth/heritage - if that's one of the PIs - for the duration of their contract? Or do they have to agree to a clause not to accept an invitation from the ABs for the duration of their contract (= not the same thing)? Or is this just an agreement between NZR, RA and the PI Unions?