It’s good to be skeptical, but this guy is the inventor of quite a bit of architecture software supporting modern systems

I think it’ll be fine

It’s a terminal multiplexer. Nothing in this announcement suggests to me that using this multiplexer will require the user to get root or super-root or any additional permissions. It’s what the user already has access to, but more “durable” (which I take a mean terminal session history on by default). And I don’t believe any short-lived secrets like ephemeral keys could have their lifetime extended by a terminal multiplexer. And nothing really supersedes RBAC which any respectable org should be using always.