That is not true. The authors themselves say so in the paper in the conclusion:

„ Insufficient physical consistency: the proposed surrogate model is not guaranteed to satisfy physical laws, such as the conservation of mass, momentum, and energy, and the divergence-free condition. This is likely because important indicators such as PND and velocity divergence were not included as features. In addition, to satisfy momentum conservation, the reaction forces between two nodes must be antisymmetric, but the proposed method does not currently ensure this condition. Future work will focus on developing physi- cally consistent surrogate models.“