I do not understand the question I guess – Since this is just one unit cell, and there are multiple next to this one, I feel like it has just the normal axis (x- y – z ) as rotation axis? Nothing special about this then and the same case as in the video – eta = 0
(except for the II-b, it has no rotation axis for the x-y plane but 4 fold for z-axis/ II-a no rotaton around Z axis/z-y plane)