tbh I don’t really see how the paradox is solved. Maybe there is a difference in sign of the energies between the two slides? The energies in the plot of this video are all negative energies, so if the sign would be reversed, then the two graphs swap positions, and the tmA shift would be positive. It’s a guess, I’ll have to check the other answers.
new idea: maybe it has something to do with the fact that we are considering discrete point charges, and hence a bad approximation for the continuous charge distributions of electron cloud and nucleus.