I’m not sure what you mean. The end of the post pretty clearly describes the framework they’re using to roll out these exploits as latent files within the Signal app.
And Signal can develop a few land mines to deploy at any time, and just... hold on to them for a rainy day.
At some point if someone breaks through multiple levels of advanced security to, say, steal your gun and then shoot themselves in the face with it, whose fault is that really...