https://www.nature.com/articles/s41586-023-06377-x
Authors. Willett FR et al
Venue. Nature 620:1031
How the Institute flags it
frontier 4 times established 3 times
This source carries more than one flag across the corpus. That is not an inconsistency to resolve: the same work can be established evidence for one claim and frontier evidence for another, and the flag belongs to the use rather than to the source.