I think he’s saying that it’s not the actual true word of God, but still teaches valuable lessons about right and wrong.
But I could be mistaken.
In that it's not God's dictation, but His inspiration through his children, he's correct. Christians, as an orthodox whole, do not have the same view of the Scripture as Muslims for the Koran, for example. The Muslim dogma is seen as idolatry, and in Christians, bibliolatry specifically.
From reading the article, my impression is that this man was taught differently, and when he learned the difference, rejected his whole teaching. An understandable, though foolish, reaction.
Something that Christian teachers should be careful of.
I disagree with the author. It’s more than just lessons about right and wrong...much, much, more.
The New Testament is the foundation of today’s Christianity. Without it (no Messiah, no resurrection, etc.,) it’s all for nothing.