OK. With all due respect, I've found anyone who uses the terms 'godhead' or 'oneness' are mystics who assert illogical things, which is rejected out of hand.
Deference is given, not to possible confusion of oneness, but to the 20,000 x God is referred to in Scripture using singular pronouns. This refers to a Being, a Supreme Being, who is 1, singular, which stands alone, not a plurality, a unity of multiplicity of persons. YHWH says over and over again that he (singular) is the only God.
I recognize even today people still use the term "one" figuratively, to mean they are on the same page. "Your mother and I are one on this matter" means they are of the same opinion, not they are the same Being.
I (singular) am Yahweh, and there is no other.
There is no other Elohim besides me (singular).
Isaiah 45:5 NOG (Emphasis added)
I (singular) am El, and there is no other.
I (singular) am Elohim, and there’s no one like me (singular).
Isaih 46:9 (Emphasis added)
You will know that I (singular) am in Israel.
I (singular) am Yahweh your Elohim, and there is no other.
Joel 2:27 (Emphasis added)