Because it’s first and foremost a security door, maybe certain technical details of its design weren’t made common knowledge. On purpose?

This tidbit was news to me. Operationally, it’s hard to see how it makes any difference.(It’s all out there now though.)

In a rapid depressurization, everyone in the back is donning masks and getting cellphones out (not necessarily in that order).

The average passenger isn’t going to care, or notice, that the cockpit door is open.

(Could just be garden variety misreporting. Including the NTSB brief. It’ll all get sorted out in a few months)