Unable to build Debian packages using the content in this repo

I'm trying to build Kea packages locally, on an arm64 machine since I need packages for that architecture and they aren't available in the Cloudsmith repositories.

While this repo's description says it is 'private', it's not actually private so I decided to try to use it.

Unfortunately dropping the debian directory from this repository into a Kea source tree and then trying to build the packages failed, because the debian directory contains patches which cannot be applied to Kea 2.2.x sources.

Is this repository actively in use for building Kea packages?