Why should there be a hidden meaning?
That’s kind of a theological question that goes to God’s motives. It could be that God desired to reveal a compressed history for the sake of terse simplicity in an ancient Hebrew context and to emphasize His role as creator of all things and the importance of the seven day work week.
As Deuteronomy says, “The secret things belong to the LORD our God, but the things revealed belong to us and to our children forever, that we may follow all the words of this law.” (Deuteronomy 29:29)
Or, as Proverbs explains, “It is the glory of God to conceal a matter; to search out a matter is the glory of kings.” (Proverbs 25:2)
The author of Matthew’s gospel identifies a numeric pattern when summarizing the genealogy of Jesus in Matthew 1:17. We’re not really told what the significance there is, but the point is that Judaism has a long tradition of finding subtextual connections.
It’s not any deeper than the traditional understanding.
It’s deeper in that it’s not immediately apparent if the face-value reading simply implies creation via six consecutive solar days with no expressed creative mechanism (evolution). It’s not really an alternative sequence, Schroeder claims that the order of events in his model is the same as the biblical account while being expressed to different degrees of complexity and clarification (though you and I would see legitimate inconsistencies, where Schroeder would likely claim there are none).
Schroeder also claims that the phrase “evening and morning” denotes a deeper meaning where each successive day consists of the world progressing from “chaos” to “order”. Things like this, along with the use of physics and math to reach his conclusions, are what lead to his view being a more mystical / esoteric approach.