Our machine-learned potential agrees well with the one from ab-initio dynamics. Results of both are in good qualitative, but not fully quantitative agreement with experiments. Namely, the PBE-based dynamics and the corresponding NN potential predicts somewhat too small desorption barriers, and as a consequence, too large desorption yields, too small isotope effect, too low saturation fluence for superlinear dependence on fluence, and, also, too small effects of a dynamic environment.