In any case, as I've pointed out above, salt measurements do not limit the amount of liquid phase electrolyte leaving a cell because it can be either direct (carrying salt) or recondensed (with no salt).
That's wrong. Recondensed liquid does not leave the cell. It falls back into it. This is a reflux cell. Only vapor leaves the cell, and only vapor is accounted for in the boil-off calorimetry.
The shape of the cell ensures this. It is a distillation retort. These were developed in medieval times.
As I noted on the previous page, you are wrong about this: "You will note that I am considering vapour that condenses before it [exits] the cell as entrained liquid-phase D2O." You miss the point. Entrained liquid-phase D2O cannot leave the cell. It falls back in. That is what calibrations with Pd-H and joule heaters show.