The way in which the controls are moved is not relevant, IMO.
As Tinny says, "in trim" means there is no power required to hold the controls in neutral position.
I think it
is relevant. I don't know anything about powered systems, but in an unpowered system stick-free does not necessarily correspond to elevator neutral (i.e. in trail). It corresponds to the elevator position with zero-hinge-moment.
In a powered system, I could envisage a situation where stick-free does not correspond to zero-hinge-moment, because the designer of the control system can arrange it that way. So it could be designed to be in trail when stick-free. Whether that is the way these things are in fact designed, I don't know.
I suspect we're just debating the definitions of
neutral, whether mechanical or aerodynamic.