you can still kill the boss lol. Its not that hard.
It's not about whether or not the content is clearable, it's about a known bug not being addressed in any public manner until the content is pushed to live servers and end users experience it. In any other place in the IT field, pushing something with a bug of this magnitude that has been known about for weeks to a live environment is unheard-of levels of sloppy and unprofessional. I expect the multi-billion dollar game dev that I'm giving $15 a month to have QC standards at least as high as a mobile game startup.
How you manage to kill him?
His voice sounds weird also.
It's Blizzard's politics of non-communication that drives me nuts for years now. Their patch notes are "patchy" at best with a ton of undocumented changes made on each patch release (be it retail or classic). Communication is non-existent... I mean, other (large and small) game developers are capable of communicating with the community on a regular basis which leads to overall less frustration in my experience. But apparently, Blizzard can't be bothered.