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.
This will be handy for those couple of Windows-only applications I have that need an Internet connection and don't yet work under Wine. Gives me a bit more time to try to debug them and see if a fix is possible.
Something doesn't quite add up for me, though, with the "free" option of "Use Windows Backup to sync your settings to the cloud" or a $30 payment instead. Is Microsoft really that keen to get everyone's settings, or is this an error in the press release and what they really want is everyone to use Windows Backup to transfer all their files to Microsoft's cloud (OneDrive) in preparation for Windows 11?