This repository hosts only compiled release binaries (installers, AppImages, signatures, and updater manifests) for several internal projects — it contains no application source code, and never has.
If you're seeing a "Source code (zip)" / "Source code (tar.gz)" link on a release page here, that's a link GitHub generates automatically for every tag on every public repository — it can't be disabled, and it points at this README, not at any project's actual codebase.