Reading the article, it seems to be on one hand promising, but on the other the characteristics of the material seem to be somewhat flimsy, and they seem to have made a few different samples then modified them between tests.

The final result of becoming an ohmic metal at 127C, with at least a couple orders or magnitude jump, seems to be consistent, so that's something. The behavior below 127C though, looks kind of iffy. Maybe because they tried different manufacturing and processing methods, maybe because of the different breakdowns they describe in the article... which they don't fully describe reversing, so it gives the impression of being a borderline one-way only superconductor that starts conducting at about 25C, and in a real world application could lead to a cascade effect from there. There seem to be no recovery behavior tests either, which could be understood for an initial paper, but is a pity not to have them.

The measurements they show on the graphs, are for very low voltages and intensities, so that maybe could explain why the piece on video fell down (lost superconductivity due to overheating), then sprung back up (when it cooled down). Or maybe they just blew on it to cool it down enough (which would be interesting on itself). The material structure transitions are somewhat complex, and happen basically all over the range from -75C to about 50C, changing its characteristics.

You're right, this seems much more solid than the Em-drive case. It needs better reproducibility and better characterisation, but otherwise looks promising for at least some applications.