This isn't his first time posting about being inundated with AI spam. I suspect that, being a moderately famous writer, the level of spam he's receiving is a wee bit more than a normal person is used to. And I get a _lot_ of nonsensical AI spam myself.
AI can trivially replicate average-ish and somewhat above human writing if given a tone sample to copy. Getting to replicate the quality of writing output of a decent author, probably not without a lot of effort, but the threshold here is to sound like a plausible e-mail from a book club or similar group, not to write the Great American Novel.
Authors are being absolutely inundated with these. I've gotten 2-4 a day for the last couple of months, and it's really obnoxious.
A lot of folks can tell that it's AI, but some folks can't.
> Unless he is saying ai can replicate human writing?
It can definitely replicate a human-written email.
I think you underestimate how much mail famous people get.
easy enough at scale of how many easy-enoughs per hour?