I'd have to agree with the A330 quote - the tail would be producing less downforce. The tail downforce acts the same way as weight does - down and needs to be compensated for by lift. So increasing the angle of attack on the wings will create more lift but also more drag which slows the plane down. This explains why more weight or a forward CG will decrease cruise performance.
I think it's safe to say that the tailplane on that aircraft was generating a downforce!
I completely agree - but I'd also say that the CG has changed drastically! I would say both conditions contributed to the accident in this case.