I could not disagree more strongly.
The verse of Scripture that is probably the greatest doctrinal statement in the Old Testament is found in the Book of Deuteronomy
It takes a monumental torture of the plain meaning of that passage to read it as saying other than what it clearly says.
This is the word used in Deuteronomy 6:4 (my paraphrase), “Hear, O Israel: Elohim—our plural God, our Trinity, tri-personality—is one God!”
Elohim is not even found in this verse!
The name of God used here, in both instances, is YHWH, not Elohim.
Echad can mean either singular or plural unity (as "one" does in English: "one chair" or "one dining room set"). The specific meaning in the passage is determined by context. I cannot read the context here as indicating anything other than singular unity. It doesn't say "the LORD is One Trinity"; it says "the LORD is One".
I amand there is none else;
Beside Me, there is no God (Elohim).
I engird you, though you have not known Me,
So that they may know, from east to west,
That there is none but Me.
I am
I form the light and create darkness,
I make weal and create woe--
I