Just for the record, every Shining game I've ever seen has some kind of compressed and/or encrypted text. Here are all of the games I've actually looked into:
Shining in the Darkness
Shining Force 2
Shining Force Gaiden
Shining Force: The Sword of Hajya
Shining Force: Final Conflict
Shining Force CD
Shining Force 3 (only looked at Scenario 1, and I can't tell with the other scenarios, not knowing Japanese)
I haven't looked at Shining Wisdom or Shining the Holy Ark yet (looking through files in an iso isn't the funnest thing in the world), but given the histoy, I'd be surprised if they weren't.
I bet Shining Soul will be the same way, when it gets released.