Well, this is something somebody started a few month ago and it magically reproduced itself until everybody thinks its true, this is how the internet works 
Anyway, to clarify this and without going into too much detail: Aerofly FS 2 for PC is not a port of the mobile version, its actually the other way around. Our main development platform is and always will be the PC. A few years back, when we started work on Aerofly FS 2, we quickly saw that it would take quite a bit of time to finish the PC version. So we decided to come out with the mobile version in between. This didn't interrupt the main development process for the PC version that much, as we already had experience with mobile development.
However the whole code base of our PC and mobile version are pretty much the same and with respect to the pure airplane physics, both platforms pretty much do the same, its amazing how quick those mobile devices are these days! We even have some extra CPU capacity left to do more advanced airplane physics in the future.
But even though the code base is the same, the PC version does run in quite a different configuration, e.g. the airplanes have a lot more texture, more complex shaders, interactive cockpits and we also compute a lot more with respect to collision detection. The same holds for the overall rendering, the terrain, runways and buildings are rendered with more textures and more polygons. Some of this is due to different resources some of this is done during runtime and depending on the capability of the PC or mobile device.
So to keep this short, Aerofly FS 2 for PC is no port from the mobile version.