The author said "I hope to get around to posting it on F-Droid soon, it doesn't seem like too much work" back in 2023 <
https://news.ycombinator.com/item?id=36051011> but my 3rd-hand experience with F-Droid is that it
is a lot of work
There is an issue tracking that outcome if you wanted to follow it https://github.com/SimonHalvdansson/Harmonic-HN/issues/185