Earlier quoted context omitted.
Um, did they announce opensource firmware without providing the source?
Based on what I understand, pull requests are coming. In the meantime they provide directions for people that want to contribute here -> https://github.com/Keychron/zgm/blob/main/CONTRIBUTING.md
> This repository is a lightweight analysis and report-generation workspace.
And "please contribute to our blank open-source project" can be taken with a grain of salt.