Well, I was very interested to see what was completely unfamiliar to me being given as the New Zealand nat'l anthem. I have had that on my list of favorites for some time now, and that verse is not included. Here's what I have, by Thomas Bracken. I can't even make the words on WO'N's site fit the melody.

God of nations! at Thy feet
In the bonds of love we meet,
Hear our voices, we entreat,
God defend our Free Land.
Guard Pacific's triple star,
From the shafts of strife and war,
Make her praises heard afar,
God defend New Zealand


Men of ev'ry creed and race
Gather here before Thy face,
Asking Thee to bless this place,
God defend our Free Land.
From dissension, envy, hate,
And corruption guard our State,
Make our country good and great,
God defend New Zealand.


Peace, not war, shall be our boast,
But, should foes assail our coast,
Make us then a mighty host,
God defend our Free Land.
Lord of battles in thy might,
Put our enemies to flight,
Let our cause be just and right,
God defend New Zealand.


Let our love for Thee increase,
May Thy blessings never cease,
Give us plenty, give us peace,
God defend our Free Land.
From dishonour and from shame
Guard our country's spotless name
Crown her with immortal fame,
God defend New Zealand.


May our mountains ever be
Freedom's ramparts on the sea,
Make us faithful unto Thee,
God defend our Free Land.
Guide her in the nations' van,
Preaching love and truth to man,
Working out Thy Glorious plan,
God defend New Zealand.

This isn't, perhaps, the best poetry ever written, but I wouldn't call it trash. It sounds very old-timey and full of fervor, and what anyone is fervent about, I will not belittle or disparage. I rather like it. I admire people who are not afraid to get right up and state their position, probably because I've had so much trouble overcoming my fear of doing just that.
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Hmm--having just re-read the portion of the site in question, I see that it doesn't--quite--say that Moan the Waves IS the nat'l. anthem, but the implication is sure there.