I assume it's being used literally, rather than metaphorically, here.
The issue is the use of Latin at all. In D&D it is usually a matter of if the character knows the language they here what is said in the first language of the player, and if they don't they understand nothing at all. Using Latin makes it a matter for the PLAYER, who may or may not understand what is said.
Latin is often associated with the Hells, so it could be an "infernal" term. I do not like that association, but it is rather common in games.
