Is it actual engine noise though? I thought it was noise created by a sound symposer located in the boot which plays the sound through the stereo system. I can't find exact details but it does seem like that would mean its some kind of electronic reproduction of actual engine noise. Unlike the old sound generator tube which simply used a pipe from the air box directly into the cabin to amplify the sound of throttle bodies devouring the atmosphere.
My take is that I couldn't give a toss if the noise is real or fake as long as it sounds good.