New Zealand: a universal pension, so the portfolio does less
New Zealand Superannuation is universal and provides part of retirement income; it is not modelled here. New Zealand is the outlier in this list. NZ Super is payable from 65 with no means test, and it does not depend on a contribution record, residence, not contributions, is the qualifying test. Almost every other country here pays a pension that reflects what you earned and what you paid in.
Two things follow for the projection. First, the income shown here is genuinely additional: the pension is not clawed back as the portfolio grows, so every dollar this page projects is a dollar on top. Second, because NZ Super is a flat amount rather than a share of your earnings, it replaces a large part of a modest income and a small part of a high one. The higher your salary, the more of the gap the portfolio has to close, and the further the income target on this page should sit above zero.
KiwiSaver is not modelled separately either. If you are contributing to it, that money belongs in the contribution figure on this page, count it once, and do not also treat its eventual balance as reducing your target.
New Zealand assumptions: a 7% nominal return and 2.5% inflation, a real return of 4.39% a year.