People are putting to much stock into this lore. As many things that have been found in this game by the community. Cheeses, glitches, and for instance the first vault runs ever.
Any secret still there would have been found by now.
There aren't any secrets to find.
Everyone wants to find secrets in the lore to go and inspect in the game... do yall remember they said they had a write come in and write the Grimoir lore after most of game was complete. If there were secrets to connect from Grimoir to game. The Grimoir would have been around prior to development start.
The game was made. Then the lore was established to give us something to do once release got closer.
Just sayin. There's nothing there. That's why none of it makes sense in game
English
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The grimoire was written after much of the dialog explaining destiny was stripped, to keep that knowledge available to the player. Meaning that the facts inside the grimoire were in the original development