I haven't heard or found anything on it any newer than what you have.  The only document I've seen that has a newer date on is this https://ccrjustice.org/sites/default/files/attach/2019/04/75%20Ps'%20Reply%20in%20Supp.%20Motion%20to%20Amend%202019.02.13.pdf but there is no new information on it.  I was never in direct contact with the plaintiffs but Brandon Gordon might be the only way to get an update.
Zach hasn't really responded to anyone that new him before he started Lab Rat Mining since things really started going south.