Silly people!
I mean if you read it, I could understand a bit what you might think, but if you really read it, it is saying that if you are the one filing, then you need a SSN or a ITIN (and that NRA is not accepted) which makes total sense, but if you are simply reporting that you are filing seperatly and your spouse is an NRA, then it would make no sense why your spouse would need one.
Of course, my relationship with my civil partner isn't even recognized in the US, so I still have to file as single, though in every legal aspect in the UK, I am not.