PFE is watching AI being controlled by FSX ATC and it is then reading out it's own version of the instructions with better voices and regional accents, it never actually commands AI to do anything that the FS ATC hasn't already told it to do, just because you cannot hear FS ATC voices it does not mean that it is a free for all in the sky, FS ATC is still in control.
The only time it does anything to AI is during possible runway incursions as I had said previously and even that facility isn't perfect because the AFCADs for airports are sometimes built in special ways to reduce traffic congestion which allows them to cross runways regardless of whether the runway is clear or not.
The User aircraft on the other hand is a completely different matter and yes PFE is sending you instructions all the time.