To be clear, I'm not trying to argue or disagree with you. I agree that PPAs are a fine option. I'm not trying to disparage them, I'm trying to explain the reasoning behind my suggestion: PPAs enforce a number of requirements that exist for a reason, but that can be a challenge to meet depending on the project. The biggest example is that of source packages. I don't mean "your source needs to be open" (which of course this project is), but rather "your software needs to be built on Launchpad infrastructure." If you take a look at the existing CI the maintainer has in place to build the binary deb, you'll see what I mean: https://github.com/sinelaw/fresh/blob/master/.github/workflo... . The maintainer already has this, and it would need to be completely re-done to make it work in Launchpad, and the amount of work might be quite significant. A standalone Debian repo can just have binary debs, i.e. the work that has already been done can continue being used.

Thus my recommendation for aptly/reprepro: it's a more natural extension of what the project already has in place rather than a "you should do this instead."