There were announcements and security ping in the arch Linux community discord... But I wish they'd be more vocal on this outside discord especially given discords controversy as of late
Update: they finally posted about it in the arch news feed last night... A bit late but better than never. Npm removed the malicious package, but then the bad actors started using bun instead...
As others have proposed, I really think that orphaned packages should require a moderator of the aur to approve the commit and acquisition of an orphaned package. Currently nothing stops someone from spinning up accounts and hijacking these abandoned projects