I've heard in one of his videos that Jonathan Blow ditched the AOS -> SOA conversion feature, but he may come back to the idea sometime later.

(One problem with Jai is that unless you are viewing his Youtube videos regularly, you cannot catch up on what is going on with the language...)

That's unfortunate.

I think that was just refactoring tools.

I’m pretty sure Jai has (or at least did when I last looked) a type modifier keyword that changes the layout (the code working with it doesn’t change)

It should based on livestreams, but details on Jai are so far and few between, it's hard to say

Yeah, my comment was based on some old fan-made documentation and the latest live streams I've seen where he talked about it (which was a good many months ago now, but it certainly seemed like its supported)