Motion does not work on older IOS versions

[amerritt14]

Issue: Incompatibility on iOS: 12.4

Reproduction:
In a mac with Xcode, download the iOS 12.4 Simulator by going to Xcode -> Preferences -> Components.
Open the simulator. Xcode -> Open Developer Tool -> Simulator
Choose an iPad using iOs 12.4: File -> Open Simulator -> iOS 12.4 -> iPad 6th generation(I don't know that the type of device matters)
Open Safari and navigate to the Calculator Demo app, https://motion-demos.herokuapp.com/calculator
Notice that the buttons are non-responsive.

It appears to work on iOS: 13.0, so I'm not sure if this issue needs a fix, considering iOS 12.x is only receiving Security Updates.