Correct - except Oracle didn't just close ZFS, they closed all of Solaris. And they did it in the most spineless way ever - they just stopped releasing code without ever bothering to address the community.
Primarily, it was OS/Net that source is no longer available for.
Some consolidations such as pkg(5) (aka IPS) are still open and some components moved to already open consolidations such as userland even though license did not require it.
