Actually, we are not. According to Yo-Yo, in terms of thrust, we always have a brand new engine/aircraft when we jump into the cockpit of the aircraft, another detail that might be somewhat related to this is that back in 2009~ during the (sim) development, the Charlie model was still a "new" thing, although it was initially tested 4 years before. So I'm assuming our cockpit in the game also looks brand new because of the fact that the new Charlie cockpit was also "brand new" back when the DCS: A-10C was being developed, hence the lack of weathered cockpit (I'm not saying this has anything to do with thrust - just saying that this collaborates with the "brand new" argument I used).
Back to the thrust, yes, the engines are supposed to perform like a brand new engine, which means the compressor efficiency is as good as it gets (or as it should...), turbine tip clearance is good, no dramatic changes in geometry etc...
So in order to do an affirmation like that, you must at least prove that the performance is the "worst possible"...