I’ve always been a man of few words.
Why bother and try to strangle each other about Pre-Prism Pentad or Post-Prism Pentad?
Athas.org followed the OFFICIAL revised boxed set. So is the way to proceed.
If you wish to create your campaign PRE-Pentad, just play it PRE-Pentad.
All the inconsistencies that happened before or after PP can be explained in an “errata” document. Once it’s been done, all new products will follow this line.