I *think* this is a recent-ish preprint of the same paper they're talking about. (The current Nature version is neither open-access nor accessible on Sci-Hub).

https://arxiv.org/abs/2005.05811

(E.g., both papers contain this [0] text string pointing to the same URI. But, the arXiv preprint doesn't mention the Nature submission).

[0] "All data supporting this study are openly available from the University of Southampton repository at https://doi.org/10.5258/SOTON/D1374."