If his "true trinity teaching" proposes Jesus is not the Father, and that He and the Father and Spirit existed before time began, eternally, then it cannot be oneness doctrine.
As I said in an earlier post, "It's true that there is not a great degree of difference between some versions of modern oneness doctrine and the trinity doctrine of the Nicene-Constantinopolitan Creed but there is no way one can rightly claim that modern versions of the trinity doctrine are oneness."
One can't hold to the eternal sonship doctrine and have true Christian Montheism.
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People who are always looking for fault,can find it easily all they have to do,is look into their mirror.
There they can find plenty of fault.