They observed breaking of time-reversal symmetry (TRS) at 175 Kelvin (-98C, -145F). The material itself is not superconducting at that temperature, it needs to get down to 2K for that. From the article:

Time-reversal symmetry breaking (TRS-breaking) is a hallmark of unusual electronic and magnetic behavior that can lead to exotic quantum phases: phenomena that could potentially be very useful for quantum technologies. So, finding this at a more "manageable" temperature is exciting.

Pre-print of the article is here[1]. A review article pre-print is here[2], which gives a nice overview of the kagome materials.

[1]: https://arxiv.org/abs/2402.11130

[2]: https://arxiv.org/abs/2409.04211