That article, written well over a year ago, is just another cheap shot to gain readership.
In it, the reporter refers to what is more than likely prudent tax avoidance as "Tax evasion". Big difference but the author makes the leap anyway.
Then about half way down, the article suggests there is no issue here at all. That the companies and trusts concerned pay what would have been paid by the said individuals anyway.
Cunliffe is quoted, chipping in with what we now know to be his usual wow-words "astounded and appalled". I think New Zealand must have stopped listening to him a long time ago. The election result strongly suggests so.