we all know the Governing Body communicates with the faithful through implication, they imply things they don't wanna say directly
They're not afraid of government agents, they're scared sh*+less of apostates. This is an obtuse warning, as you mention above, about apostates infiltrating the organisation.
They're asking the r+f to turn one another in if someone is sounding like an apostate, asking questions, having doubts. They want to stamp on apostate 'spies'. They know now that even many elders are pimo, they read this site and others.