Quote from the original linked article: "Our Novena Project is of course still vulnerable to techniques such as silicon poisoning, but at least it pushes openness and disclosure down a layer, which is tangible progress in the right direction."

Many of the security flaws and known back doors are in the firmware, (see routers for example), which Bunny is resolving by making Open Source. It's probably impossible to eliminate all attack vectors, but by opening the processes up, you can eliminate most of the easier ones.