Its a bit confusing as one part of the site under presence requirements says -

"If you have had more than 1 type of visa or permit in the last 5 years
You can apply for New Zealand citizenship as long as each visa or permit allowed you live here indefinitely."

My wife has not held a residence visa for 5 years just yet, but the calculator says she is ok to apply and apparently the calculator checks the resident requirement -

"The calculator will search for your travel and visa information in the Immigration New Zealand database to check if:

You have been living as a New Zealand resident for at least the last 5 years, and
You have spent enough time in New Zealand in the last 5 years."

It seems contradicting?