> be sure that the code doesn’t make it into your App Store build, else you’re likely to get rejected.

Doesn't appear to be the case! Here's a list of 611 apps using this class: https://mixrank.com/appstore/apps?expiration=2017-06-26&list...

Notably, it looks like Google, Facebook, Netflix, and Uber are all using it (or have a dependency that is). There's been a handful that were using it since early 2015, and a surge of several hundred towards the end of last year.

Here's the other related classes:

    UIDebuggingInformationRootTableViewController
    UIDebuggingInformationTopLevelViewController
    UIDebuggingInformationValue
    UIDebuggingInformationValueTableViewCell
    UIDebuggingInformationValueViewObserver
    UIDebuggingInformationViewController
    UIDebuggingInformationValueView
    UIDebuggingInformationOverlay
    UIDebuggingInformationValueViewNumber