Your cite says Boeing said:
>The actions of the pilots played a role in the chain of events that caused the crashes
Which isn't blaming them and is factually correct in both crashes. The Lion Air pilots didn't disable electric trim and the Ethiopian air ones turned it back on. Those actions played a role in the crashes. Whether that makes the pilots responsible and at fault for the crash is a separate question.
>If you want to fix the problem, you must know what the problem is.
And, again, the problem (among other problems) was that the designer of the aircraft made assumptions about pilots that were incorrect.