LSGG is a scenery made for FSX, that runs in P3D due to backward compatibility, so it doesn't have any dynamic lights.
While it might be theoretically possible to add them, they won't look very good, because they would clash with the included lightmaps (static lights baked in the textures), and in general, dynamic lights require a scenery to be fully made in PBR from the ground up, so it would be a complete rebuild from scratch, which is not planned.