I'm pretty sure for E-M1 Mark II and newer, the electronic shutter does not count towards the global shutter counter, cameras using Truepic VIII and later only count mechanical shutter actuation, so the displayed number *should* be accurate
So.. if I understand correctly, the 550 € used PEN-F I bought 1,5 years ago had only ~1000 photos taken overall, not mechanical shutter count? Wow, hard to believe. If true, me likes.
The company did say that the older gentleman who sold it, had had it in the closet mostly. So could be true.
Would be very strange from Olympus to let mechanical shutter count to get mixed with electronic with earlier models. Power-On count might help with determining some of this stuff if buying something used.