The headline is missing an important bit.
Boeing knew of the flaw, and sent a letter to airlines about it. In 2011.
FWIW, the MD-11 was designed by McDonnell Douglas, and manufactured by McDonnell Douglas in 1991, before the Boeing merger. A McDonnell Douglas DC-10 failed in a similar way in Chicago in 1979, so it the issue may go way back.
Well yes but Boeing also said it "would not result in a safety of flight condition."
There's a lot of gray going on here.