I have asked an expert for PC Engine CD games and he replied:
Hmmmmm ... you could have just asked me the same question here on romhacking.net, and I would have replied.
Publicly cross-posting a screenshot of a PRIVATE
Message from another forum seems a bit ... not-overly-polite.
FYI, I gave you the simple non-programmer answer to your question.
As a programmer, CyberWarriorX presumably already knows that the typical hard-coded-assembly-language anything-goes-anywhere structure of PCE games would be a very different challenge to the C-code or resource-file-based organization of some of the later consoles (Saturn/PSX).
Now ... it's certainly possible that the PCE's Langrisser developers took a more C-like (easier to hack) approach to the storage of their string data, but that's a question that's way-beyond a simple generic question in a PM.