The only ability he lost was force lightning. Raccoon come to the darkside we have mask shirt Palpatine himself said that Vaders handicap was his own doing because he could never come to terms with what he had done. This was psychological, not physical. Due to him never fully giving in to the dark side he lost 40% of his potential. In the book Darth Plagues, we learn that force potential was not affected by cybernetics. So really the only thing he lost was the ability to force lightning, and the ability to live without his suit. As a developer, you are always behind when it comes to (new) technology. It becomes harder and harder to learn new technologies since they have longer learning curves. For a brief moment, Dooku thought that the Jedi Master had made some kind of error. But he quickly realized that someone of Yoda’s level simply would not make such a rookie mistake and that the only explanation is that Yoda wanted Dooku to sense him coming.
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For the first time, Dooku begins to tremble and was Raccoon come to the darkside we have mask shirt afraid though he didn’t understand why he still believed that the dark side was stronger. I surmise that is because he knew that Yoda could have defeated him on Geonosis as was hinted at in the Attack of the Clones novel had he wanted to and that Dooku was still rather unnerved by how easily Yoda repulsed his Force lightning, something that was supposed to be impossible for a light side user to do. Yoda chose to make his hut nearby, probably only a kilometer or so away from this dark side cave on purpose so that the dark side energies that are contained there would cancel out his light side signature in the force making him effectively invisible without his having to consciously shield his presence in the force the entire time he was there.