My reasoning is that you said "Then consider the fact that at some point as the universe expanded, the size of the *observable universe diverged from the size of the *total universe."
I would change this statement to "will expand".
I think that the CMB indicates that the total universe has not yet expanded beyond the observable universe. The CMB is, so to speak, the edge of the total universe.
I think this is one the points that the article mentioned makes.
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