The intelligent NPC in <<REBIRTH>> had pretty advanced AI. Usually, everyone relied on the language to determine which were intelligent NPCs.
As AIs cannot lie, other than those special AI who were extremely intelligent who could, it was not too difficult to differentiate them from regular NPCs.
This time's inner demons could lie so it meant that the officials allowed it to lie… They even seized the easiest way for players to differentiate them… The more frustrating thing was that the inner demon could attack and yet they had to ensure no players died to pass the round.
That meant that they were holding an unpredictable bomb which they could not let it explode nor hurt anyone. The designers were really too despicable.