I am not getting this kind of journalism. Guardianmag magazine article is a direct copy paste from https://phys.org/news/2021-03-simulations-earth-oxygen-rich-.... Yes, they cite that as a source (oddly enough, Guardianmag has not added web site address as a clickable link, why?). They didn't have any incentives to add some more details, anything, just copy paste.

It would be so great to learn some more details about the model, etc.