However, as awesome as this is (composite cellular constructs have always been very difficult), it's probably not especially applicable to biorobotics, because they're using the "wash and repopulate" method for growing the appendage. Basically, you take an existing appendage from a (presumably NOT living and breathing) fully-developed donor animal and strip it of all cellular material. That leaves what's called the extracellular matrix, which is a little bit like the rebar in a reinforced concrete lattice. So ignoring the obvious ethical questions here -- of which there are many, and which are critically important not to ignore -- but ignoring them, if you wanted to build a cyborg robot thing, you'd be much better off skipping the wash and repopulate, and maybe even skipping the "dead" part.
But from my perspective, that's no fun! I'd much rather design my own system from the ground up and have some flexibility to make improvements to "design" unconstrained by the very slow process of evolution. So in that case, I'd want to be able to 3d-print the extracellular matrix[1] and then populate it however I deemed fit, integrating it with a more efficient nerve-computer interface from the start.
[1] People are totally working on this which is absolutely amazing. https://www.google.com/search?q=3d+printing+extracellular+ma...
On the plus side, there will be a sudden popularity in delicious noodle bars.
"Attack ships on fire off the shoulder of Orion; I watched c-beams glitter in the dark near the Tannhäuser Gate..."
"All those... moments... will be lost, in time, like [chokes up] tears... in... rain."
"Time... to die."
Of course people will still look for it, but implementation trumps intellectualization.