There are 2 members in the disposable-email-domains organization on GitHub.[1]
You (martenson) are one of them. The other member (di), who is a "core maintainer" of the project according to the README changelog,[2] is also a member of the Google organization on GitHub.[3] di describes himself as part of the "@google open source security team"[3] and the website linked from his profile says that he is "a Developer Advocate at Google".[4]
Thanks for summing it up. All of this is correct afaik. What I wanted to respond to was the implication that Google is somehow part of this. It is not. This project started before Dustin joined Google open source and was already couple of years old when Dustin himself joined.