Jonathan Blow's Programming Language

https://www.youtube.com/watch?v=gWv_vUgbmug
https://github.com/BSVino/JaiPrimer/blob/master/JaiPrimer.md

what happened to that?

He's still doing streams about adding features to the compiler every now and then, but apparently he doesn't want to release it until it's production ready and has been beta tested by some select few people of his choosing.