I was listening to some journalism on the subject and the farmers association promoting this produce claimed it was due to a very good growing season with no freezes or bad weather and that conditions remained ideal for basically the entire season, which almost never happens.
Perhaps the quality of flavor of the kiwi is just affected by the climate and soil.
Another example more relevant to Italy might be the D.O.P. canned marzano tomatoes, which have unique flavors due to the soil and climate they are grown in in Italy.