They were very amateurish. They were a fake set of emails that were clearly put together in a text editor. The formatting of the dates was inconsistent between emails, and in one screenshot, you could even see the text cursor, indicating the email had just been typed on the user's screen. Apparently, even some Qanon promoters were stepping forward to debunk them. They were covered in the latest QAA podcast.
There's a whole separate world of propaganda claims on X. Another one that I'm unfortunately aware of due to my republican relative: claim that Georgia's Republican governor is planning to rig the election for Kamala by importing votes from overseas.
They were probably spread it on right wing sites to reinforce to those voters they shouldn't vote for the Dems, just in case they were thinking 'maybe I shouldn't vote for the asshole that acts like a toddler and fucked up a pandemic response when there was a good plan?' Nope next vp has abuse claims so you can't vote for them, and they are all happy with being angry anyways so it's a win.
Ugh I hate how much it seems plausible, it's like a badly written movie plot that no one would think could happen if it was the 90s, even early 00s.