Even though the nuclear codes were obsolete

The information exposes our style or patterns of security, our payload, stock maybe even locations....other countries stockpiles...etc...

due to satellites and treaty obligations. We know all of theirs also. What they don't have are exact travel patterns of strategic subs.

They were not necessarily the launch codes, more likely something having to do with development or technology. That doesn’t make it better, of course.

It's about the disposition of our forces, possibly what we know about our adversaries forces - which tells them how to defeat our forces, as well as likely sources of said information, as well as the disposition of our allies forces.

In the WAPO article, it also said that signals intelligence info was taken. This worries me far more. THAT is actually far more damaging in the real world. Unlikely anyone will use nukes. VERY likely that knowing how we communicate to our troops and satellites, among other things, would be extremely useful in war. Think of, "hack your GPS so that the missiles you launch hit the targets we want them to".