You are assuming that Android reports on every step you take. Do you have sources backing this claim?
Aka NSA's "we really need to get access to this device and will fund diverting backbone traffic / writing firmware malware / whatever else we need to in order to get it" team(s).
Eh, that’s exactly what it is currently advertised as.
A tool, supported by Snowden, to be used by journalists who are at risk of being under active surveillance by state actors.
That is the very definition of a TAO target.
And for non-TAO targets, WhatsApp is just as good as Signal – the users won’t read the source code anyway, and in both cases President Trump gets your social graph.