Thats a major attack on the US.
If your systems are compromised and need to coordinate, what do you even do if you can't trust anything, assuming the attacker is still inside the network?
Is it, though?
If the goal is to exfiltrate data, I guess it is. If the goal is to make the people working in the FBI feel vulnerable - and pushing out this sample data would suggest that it is - I don't think it is. You could probably do the same with data from social media sites and data brokers.
In general, most governments have standard operational policies that mitigate such issues (ISO 15408.) =3