The point was that Signal is authorized AND pre-installed on the government phones, so using it was legal. As for what they were discussing it didn't disclose TTPs or other classified information, the problem is not knowing whether one of the participants added the reporter or if it was added to the contact list previously by the COMSEC office. (because they hand the phones out from one person to the next for continuity/security)

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course