About Periodic boundary condition invariance

For general MPNN as CGCNN and Schnet, crystal graph as multi-graph is invariant under different supercell. I wonder if Graphormer can achieve the same invariance. More specifically, will the results of a unit cell input structure and a supercell structure of Graphormer keep the same? I don't think it achieve pbc invariance as the graph is changed for different supercell. I'm surprised that Graphormer can performs excellent not only molecules but also crystals! Thanks.