From the Reuters article you linked, the only hit from "ctrl+f confirm" now says:

> Researchers have also flagged work by an "AI scientist" team, the existence of which multiple sources confirmed.

Maybe it firmed up in the 6h-ago update, and so other sources started publishing more widely? I'm realizing I need to get in the habit of re-reading source materials, instead of going off memory on an evolving story like this :)