Regardless of how we are supposed to interpret this post ending lore, it's confusing to why its been implemented this way.
To have a long, animated cutscene set out a bunch of plot points (Noah terminally ill, new weapons, etc) only then to have someone hand you a note that says 'legion ded, Noah ded, all resistance winz, gg' is so jarring. Why even bother making the cutscene?

Also not everybody reads the field notes. Can imagine a couple of 'what ever happened to Lyon & Noah???' forum posts in a year or so.