It seems to say that when an iOS device is powered down and then
powered on again, whatever app that was in the foreground when the
device was turned off will show in the foreground again when it's
powered on
That is what it says but that’s also completely wrong (-: On a typical user system, iOS boots to the Home screen, not the last app that was in the foreground.
If you’re working with a managed device you can configure it to boot to a specific app. See this post for more info about that.
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—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"