The point is that the Bible Says that God inhabits eternity.
It doesn't say He inhabits a bunny suit.
(except at easter, of course.) :>)
The word "concurrently" inherently is a "time" concept. One can not use time concepts to explain timelessness.
Likewise, "before" is also a "time" concept. The use of this word by definition cannot even begin to communicate God's timelessness because the word itself involves "time".
In reality, we cannot help but utilize "time" concepts when describing God.
If someone can say, "God exists before Abraham now", I can respond by saying "God will exist before Abraham now". Do you see what I mean? That is simply a nonsensical statement if used in an attempt to understand how God relates to time.
Jean