Whatever the case the planes all had similar issues with momentary nose elevating issues, then a direct nose dive. The 767 was just taking an alternate course

Whatever the case the planes all had similar issues with momentary nose elevating issues, then a direct nose dive. The 767 was just taking an alternate course around weather. I find it hard to believe the 767 pilot who was very skilled decided to nose dive on their own at -49 degrees pitch. Something with the system was off for it to do that.