Watch the video again. Nothing comes out through the tail, and the tail is intact on impact.
The plane stalled. Could be pilot error, mechanical malfunction, or load shift, but nothing popped out the back end.
It didn’t say really that went through the tail as in out the back end of the airplane. I understood it to be saying that it went through an interior bulkhead and disabled the hydraulics. The wording was newspaperese and not very precise.
IIRC the 747 is designed with some sort of barrier or "bulkhead" at the rear of the plane near,but not right at,the "tail".
It's my understanding that when that "bulkhead" is compromised in any way you've got a big problem.