I will start with a non RPG. Star Fleet Battles bills itself as a starship combat game based on information received via a data burst from the future(ST-The Original Series universe). SFB is limited to ST-TOS and Animated for its source material. Obviously, it is hard to accurately model 3D space combat using a flat hex map and cardboard counters. But the game is fun to play. Is it a simulation? Probably. Accurate? Ask me in 300 years.
Society for Creative Anachronism(SCA) combat tries to simulate medieval combat. But for safety reasons prohibits metal weapons, sharp edges and points. Also there are minimum armor requirements. Most modern folks would react poorly to a simulation that resulted in smashed bones, missing limbs and death. Simulation? Yes. Accurate? Sort of within safety limits.
RPGs like D&D/PF try to do combat but are often sidetracked by the mechanic of Hit Points. If you have ever watched SCA combat, the typical fight often lasts only a few seconds. Much shorter then the average RPG fight. Plus the SCA rules handle things like limb damage/loss, something many RPGs skip. So is D&D/PF combat a simulation? Not a very good one.
Once you introduce magic, you are leaving accuracy and getting into the world of guessing. We don't have a real world model for a fireball or teleport spell. Plus few games try to factor in how magic would influence combat. Why would a leader invest the masive reasources needed for a walled fort when it can be easily bypassed by things like passwall, rock to mud, teleport and the ever popular fly? Yet most fantasy RPGs with easy to obtain magic stick to historical Earth for how societies work. Probably still a simulation but not a very accurate one.
I have enjoyed reading the useage of large words. Some kind of vocabulary usage simulation?