BMW could set the steering weighting any way they want, hydraulic or EPS. It is not EPS in itself that means steering is light weighted.
It seems BMW are giving answers to the bigger market who complain that BMW steering is heavy, some saying "too heavy".
For myself, who had a 3-series with hydraulic steering, my current car, (an F11 535i), when configued to sport mode is virtually the same sort of steering weighting as my e91 330d was. In normal and conmfort mode it is lighter, but for me it is well calibrated to the selected drive modes.
If others are getting the changes in the X3, then how the demo car was configured may be the issue. Others have been caught out that way with demo cars.