>Your speech is the thing that triggers a series of events that you know will lead to a wipe.

The owner of the phone doesn't know that. They have no control over or insight into the officer's brain to know what they'll do. The officer might suspect the phone-wiping functionality exists and decide not to enter the password. If we start talking about ultimate causes then judicial matters become infinitely complex. What immediately caused the phone being wiped is the wrong password being entered by the officer.