It matters little what you think. The law requires flight time to be logged, therefore the ad is likely to be accurate.
I would be more suspicious about seeing the numbers different is its likely to mean that it's had a problem. A bit like one of our plastics fantastics that's just been nose wheel landed at 128hrs. That's going to have different numbers.....
Turbines are done on cycles and on airborne time. Ours tend to run out of cycles before engine life due to the short run duration of our flights. Our gas generators sit at 60% on idle but the real issue on a turbine is the start process is really hard on the engine. I even with the IELUs the starts are a high temp event and this causes more wear on the engine than running at cruise power.