Libhybris not halium, and those are open, the android driver blobs are closed and it's the same on pmOS with halium? They did start open sourcing a lot of their UI components recently, so hopefully this continues, we'll see
Btw, Jolla created libhyris back in the day for the first Jolla phone in ~2013. It has been since used by other phones and comanies for various purposes when the only thing you have is a board with only Android bionic libc compiled blobs available.