Might be shocking, but entirely true: They might have shared secret and private plans of what they're building to investors (donators?), where "malleable computer" is a part of those plans, and the full 100% implementation might not be in the source repository at this very moment. Just a guess from my side though, who knows, maybe shellscripts are what they see as malleable computers?

I think it's implemented and demoed in the Quattro release