These builds are definitely “unofficial” as are my builds for Sony devices. The fact that the name of the ROM zip files do not include the text “UNOFFICIAL” is a bug in the Docker image that we use for building , which I hope will be corrected soon. Official builds from Iodé are user builds, with no access to rooted debugging (and so no functioning backup solution). Our unofficial builds are userdebug builds with rooted debugging - and therefore access to at least one functioning backup tool.