"Despite the similarity to the apparatus used by Podkletnov, the authors carefully state in their eprint ... that their claimed result should not be confused with the claims of Podkletnov.

Specifically, they measured a tangental gravitomagnetic force created by Type I superconductors, (Elemental Lead and Niobium rings at liquid helium temperatures) but failed to measure an axial force from Type II superconductors (YBCO and BSSCO ceramics at liquid nitrogen temperatures) as described by Podkletnov. Thus, their results suggest a magnified form of 'frame dragging' rather than gravity reflection. However, there are major differences between the experiments, such as the method of driving the ring. (In the ARC experiments, the ring was physically driven by a motor, while Podkletnov's experiment levitated and spun the ring using magnetic fields.)"