Let us ask this:
If not load shift, then what else could cause a fairly modern aircraft to stall and crash on take off?
Runaway trim seems to be ruled out due to how the 747-400s systems work to prevent or rectify such automatically.
So, what could cause such an upset that would make the crew believe they were dealing with a load shift, if indeed they reported such. So far no official source has refuted claims that the crew radioed such a message. But the absence of a denial does not mean confirmation either.