If my memory serves the project started around the time of a popular blog post called NSA-Proof Your E-mail[1]. It may have been Josh's inspiration for the project, I'm not sure. In any event, the techniques described are pretty standard mail hosting and so MAIB's techniques are pretty much the same. I think it's just saying that while it does improve some things, it's not going to be what that blog post promised.
[1] https://medium.com/@cyberpunk_networks/nsa-proof-your-email-...