THAT was a B-747....different door design. But in any case, the cabin (and this INCLUDES the cockpit/Flight Deck) will not pressurize properly.
(AND, there should have been warning lights in the cockpit/Flight Deck to alert the pilots to a door not properly secured...however....some airlines might not have proper maintenance, etc...)
The article cited has multiple errors (typical of news media). In essence, the door (R2, apparently) was not properly secured, and usually that side is accessed by the catering companies. As the article states, though, the door opened inward, and the photo shows its position. It is, simply, physically impossible for that door to open outward, and then forward (as it is designed to do, on the ground) when in flight.
NO.....just.....NO!
I already explained previously that ALL the doors....(refer to your diagram)....open firstly outwards, THEN forwards. THAT is the design.
Even the "aft-most" doors (4L and 4R) are the same configuration.
EDIT: Perhaps I was unclear on the terminology. "4L" means "number 4, left side".
Conversely, "4R" means "number 4 door, right side". Hope that is clear....we start at the nose (front) of the airplane, and number the doors going aft. Left/Right, well that seems obvious.