Having read the comments I still see two major isssues with this:
This looks like an almost-as-secure-as-GrapheneOS fork, therefore creating a (false) sense of security, because…
GrapheneOS’s security is based on secure hardware (Pixel’s Titan chip) to verify the software. Only having software security without the underlying secure hardware is kind of pointless or at least well… a false sense of security.
Having read the comments I still see two major isssues with this: