Although the neural network potential used here does not directly incorporate any charges on the carbon atoms, the model does implicitly capture graphene polarizability via the DFT calculations used as training data. To determine the extent to which graphene polarizes in response to nearby ions in our model, we performed Bader charge analysis 51-54 on small simulation cells with a wide range of electrolyte configurations generated by our NNP. In In conclusion, we have investigated ion pairing in aqueous NaCl electrolytes from the bulk to the ultra-confined limit. Despite strong adsorption of ions to the carbon surface in all confined systems, we find that the NaCl potential of mean force does not change significantly until the electrolyte is confined to a single monolayer, where the slit height is 6.70 Å. In this system, we observe that contact ion pairs are less prevalent, while ions pairs separated by one or two water molecules are stabilized relative to those in the larger slits.