The tree is just like other Pometia pinnatas and yes most definately the same thing as Han Sen's pacific lychee although those pics show his ones are not solid flesh all the way through. The seeds are the same or smaller than regular fiji longans but the skin is thineer and pliable and there is a much greater abundance of flesh and proportional flesh yield, We know the natural range includes Fiji, New Britain and the north coast of New Guinea.
It begs questions on whether it may prove to be a separate subspecies, why this clearly glamorous fruit isn't in wider circulation.
Oscar 6 years in the realm of fruit hunting is a short time. I have spent over 25 years hunting for the lost crops (trees) of Kamerunga Tropical Fruit Research Station.