It’s not that Luke’s voice itself sounds off, it’s the fact that it doesn’t have the same studio quality as everything around it. It literally sounds like Mark Hamill is speaking into a bad microphone all of a sudden, not to mention that you can hear when the audio file that was pasted in ends due to its poor quality, which all really pulls me out of the entire scene. Put on a decent pair of headphones and you spot it immediately, whereas I have to strain myself to spot an AI line.