No, the renderings are very clearly solid wingsails. People have tried schemes like you suggest with propeller hybrids, but it's much less efficient than just a

No, the renderings are very clearly solid wingsails. People have tried schemes like you suggest with propeller hybrids, but it's much less efficient than just a sail, and a solid wing is about 3x more efficient than a simple sail at the same area. Don't underestimate how much force can be generated by a couple 100 square meters worth of wing.