This genre of aircraft used to have a gross error check system.
It was called - a flight engineer, we worked out take off data independently and cross checked with what the pilots got - even in Avient.
The SOP was developed from some damn good trainers with high levels of professionalism.
BUT isn't this all presumption, rather than fact?
One of my questions would be, since it was carrying heavy crew, did the aircraft have a rested change of crew at Pudong, or did the crew that dead-headed inbound operate outbound? You NEVER get adequate rest dead-heading on a freighter (in my experience).