The Brilliant Obelisk doesn't seem to work with Enchancement's reworked enchanting table. While it does emit particles like its supposed to, it doesn't count towards the enchanting tables bookshelf count at all, basically becoming purely decorational.

Vanilla Enchanting Table, without any obelisks (or bookshelves)

Vanilla Enchanting Table, with 3 brilliant obelisks surrounding it.

Reworked Enchanting Table, with AND without the 3 obelisks.

Reworked Enchanting Table, using bookshelves instead.

This sounds like it's something on their side more so- the obelisk works exactly like bookshelves do, at least on forge.