I'd say the accident has more similarities to this one:
https://aviation-safety.net/database...?id=20110312-0
This seems a more plausible explanation that jammed controls - just imagine how the earlier part of the landing would have been if the rudder had been jammed!
The nose wheel steering is electrically controlled by a computer located under the tiller on the left side only. The computer also receives inputs from the rudder pedals, and the steering is then actuated by the left hydraulic system.
The tiller allows up to 60 degrees of steering deflection, and the rudder pedals allow up to 7 degrees.
The tiller is sprung quite positively into the centre position and it's design would make it quite obvious it the control was not centered. Whilst anything is possible I find the concept of it being off center due to something other than physically turning it, or being jammed somewhat far fetched.