There also exists a written description showing the process in Python, step by step, which I consider more helpful, because you do not need to stop and play the video.
I think it's a reference to the written human language of the blog post, which when I attempt to view, is in German. I realize both of the parent comments could be read in jest; I'm mentioning this here very clearly since tone and implication sometimes may not translate, and passing readers may stumble on the context(s) here.
https://nickyreinert.medium.com/wie-funktioniert-der-sha256-...