I don't see any value in Google being more transparent here if it was either 1) legitimately a unique bug, or 2) customer error with a Terraform script.
Fwiw -- and I know there are plenty of googlers here -- the OMG isn't locked down and it was legitimately a unique bug. I appreciate the forensic analysis of public statements that the author of this post strung together, but it doesn't really advance the conversation.