Here is another post, which may be of interest for you:
The pressure is the pressure, period. The fact that some pressure is created by blowing air through a tube, which is what, happens in the cabin of the aircraft, no matter the least. His IPAD does not care if some people call it natural pressure or not. Chances are the OP cares about is this: The IPAD has been certified by the FAA for use by the pilots? Accepted as a flight crew "electronic, which means they can be used for navigation instead of using actual paper charts. To be approved by the FAA, the iPad has been shown to act in a pressure altitude 51,000 feet (in the case of rapid decompression).
So, you will be fine, regardless of what Apple says on its site.
http://forums.techarena.in/portable-devices/1397452.htm