You may be missing the point that Signal is a designed pathway promoted by Project 2025 to avoid government information retention requirements.

Whose Fwad picture is that on the wall? Trumpty Dumpty's wet dream image of himself?

...and only because they can't think of a way to blame it on Biden yet.

And it is no accident Signals came into play. Project 2025 has instructions how to do this, so the communication falls outside of information which must be retained.