I meant Signal. Mixed them up in my head when I was typing, we use Slack too, for some stuff.
FYI, that tweet is mixing up a lot of things, there. Guys that high up the food chain have multiple phones and yes, they have at least one that they can talk TS on. Signal isn't on that one. A phone that connects to the networks he mentioned isn't something they're going to use for anything except higher class conversations/data, for a lot of reasons I'm not going to discuss.
But, even lowly me had an unclassified phone on it with Signal that connected to a secure VPN automatically...even the cell signal was pushed through it.
That author is either being intentionally misleading or he doesn't know what he's talking about.
