Which ones? Searched and couldn't find anything. This MotleyFool article is over 4 years old when COVID was still raging, hardly "recent".
Corgana
Urban dictionary says it's a term that refers to when an undercover government agent fails to blend in with whoever they're trying to blend in with.
Absolutely, if you're seeing propaganda, it's because it's allowed on that instance. But the presence of propaganda has nothing to do if an account is an LLM or not.
Moderation on the Feviderse is different than on commercial platforms because it's context-dependent instead of rules-dependent. That means that a user accout (bot or otherwise) that does not contribute to the spirit of a community will not be welcomed.
There is largely no incentive to run an LLM that is a constructive member of a community, bots are built to push an agenda, product, or exhibit generally disruptive behavior. Those things are unwelcome in spaces built for discussion. So mods/admins don't need to know "how to identify a bot", they need to know "how to identify unwanted behavior".
My least favorite fun fact is that Reddit forced the KiA mod to reopen after they went private calling it a "cancer".
I was a mod at the time and Reddit always told us we had an extreme degree of editorial independence (hence the justification for allowing r/jailbait, /greatawakening, r/coontown etc) but that event made me consider for the first time that exposing normies to propaganda might not just be a side-effect, but a core function of the company.