Yes, going on the report, the overloading was one thing, but they certainly point to the aft c of g (probably out of range) as a contributor.
Added to that was the lack of night recency, on top of a relatively small number of night hours in general given the number of years he'd held his rating.
I haven't flown the type, but it seems astonishing that someone would be happy to put around 250 extra kg on board like that.