Why audit when you can declare all of this in Terraform? https://registry.terraform.io/providers/integrations/github/...
As much a fan of Terraform I am. If you didn't started defining your repos in Terraform from day 0, importing hundreds of repos, members, permission sets would be quite a lot more work than running this audit tool.
And here comes Terraformer: https://github.com/GoogleCloudPlatform/terraformer
It doesn't import anything, but generates the .tf files for you.
Disclaimer: I have used that, but not for GitHub.