Thanks.
Really appreciate you taking the time to explain that. Unfortunately the journalism issue is one of those that I haven't had a chance to look into. I like to think I'm aware of the Murdoch propaganda (and the other major "news" outlets here) but there's still clearly some topics which don't register as problematic until I dig into them.
In my experience becoming non-verbal may also depend on who you're with. It might be that your partner goes non-verbal with other people first and you last (since you are the most accepting of this).
If you're able to speak for your partner in those situations (I suggest discussing how they should signal to you that this is needed, plus in what situations it would be appropriate) that can be a big help.
Also, as a couple of other commenters have mentioned, look into other forms of communication. Texting or email is often still possible if not too overwhelmed, so again discuss with your partner - perhaps there is a shorthand set of messages or emojis they can use when they're struggling to communicate that will allow them to convey what's happening and what they need.