That's a way to turn off the keyboard's function key assigned to the play media command, so you won't accidentally activate it. The issue being discussed here

That's a way to turn off the keyboard's function key assigned to the play media command, so you won't accidentally activate it. The issue being discussed here is that certain bluetooth headsets send the play command when they connect. Hence the open source software to prevent that errant play command from launching a media app, if you happen to own a bluetooth headset that has the issue.