[jwilk]

Is it 2019? They link to a 2020 paper.

The earliest copy in the Wayback Machine is from 2020-01-07. That's also when it was first submitted to HN: https://news.ycombinator.com/item?id=21979333 (354 comments)

[aidenn0]

This was definitely January 2020 (January 7th, a Tuesday, per the Ars Technica article); I think the 2019 confusion is because that is when they disclosed the attacks to the related projects.