As someone who played Diablo III for well over a decade, yes, they’re very well known for a lack of good communication, despite many, many posts over the years promising that they’d be better at it.
Basically, they stealth changed the patch notes a few hours prior to the patch being deployed and what we have in-game now matches the changed patch notes, not the original version of the patch notes.
You’ll notice that they didn’t bother to mention this in the thread where they announced the patch notes…