Greta is one of four activists that have been sent home. According to Israel only those four signed the papers neededfor it and the rest are expected to be sent home after a court have ruled they can. Basically the remaining 8 activists reportedly chose not to give Israel the easy way of getting rid of them. I don’t have any English news sources though, as I read it in a newspaper in my native language.

My first thought was that the kid just aced their autism test, but I suppose that depends on what a failure means there

That may be true but for those literally being threatened with war it would be stupid not to act on the threats anyway. And your speculation that it’s a smoke screen sounds really dismissive the countries that now have to accept that the US might be or become the greatest security threat in decades.