Any source that this was a library? Even then that would still raise a question if OpenAI is a Russian organisation or not to access that library with good faith.
I think they just used a Russian torrent site.
apparently, the website in question is libgen.io (appears to have been taken down now), currently it has lots of mirrors like libgen.im , libgen.com.de, etc.
They're talking about LibGen, per the article.
Just go look: https://libgen.im/ (may be blocked by your isp, just find an alternate URL somehwere)
(note: https://z-library.sk/ is prettier/nicer)
They mention it in the text, its this: https://en.wikipedia.org/wiki/Library_Genesis
>Microsoft knew about OpenAI’s use of LibGen as early as April 2019