Not quite. The paper cited above [0] Figure 2 pg 17 shows conductivity as a function of temperature. A superconductor has a flat part of the conductivity at low temperature here they have not reached it. There is no transition [1]. The do say on page 8 of [0]: "Extending this approach to stabilize the dispersionless states similarly expected from the kagome network adds an exciting prospect for increasing correlations and enabling the study of magnetically driven fractionalization of states" So it may be a possibility in the future.

[0] https://arxiv.org/abs/1709.10007 [1] https://en.wikipedia.org/wiki/Superconductivity