I think this is referencing this article [1]. It actually precedes the recent one, but wasn't in English. You can see the translation here [2]. The timeline is a little weird, this is a comment I've seen talking about it, though I haven't verified any of it [3].

[1]. https://www.kci.go.kr/kciportal/landing/article.kci?arti_id=... [2]. https://gist.github.com/ConcurrentSquared/c65cbec8a05e72e3e4... [3]. https://www.reddit.com/r/singularity/comments/15bfhq7/there_...