The pineberry is probably a reselection of genes from the pre-hybridized upstream chiloensis.

Essentially re-evolving similar characteristics in the child hybrid.

Although I'm guessing the pineapple flavor is new?

> Although I'm guessing the pineapple flavor is new?

No, TFA talks about the pineapple aroma of the Chilean white strawberry, as well as a comparison to the pineberry, at length.