I just assumed it was this year, and then I noticed he linked to (presumably) his SoundCloud account in another HN comment[1], which I used as (good enough) confirmation that I had found the right video.
Yes I presume it was almost surely the last two years (this year or the past two years). The commenter replied and said he read the parent's comments to find the soundcloud account and linked that with the poster of the youtube video.
https://www.youtube.com/watch?v=G31_dEOvYuY