No, this is just incorrect.

Hun Batz prot shred doesn't (and never did) proc stone of binding.

Hun Batz ASPECT has a stun, and that stun will proc stone of binding. It still does that even with the balance change.

Looking into what our server is kicking back - I'm wondering if you're playing from a college campus wifi, or something similar?

Wondering if you can take your steam deck somewhere else and see if it fixes the issue for you. (and if you're on a campus, this would mean one not on campus) Currently it looks like the server is giving an error specifically with your requests that imply there's something at the network level especially because it's happening on both steam deck and xbox which are on different client versions.