With advances in AI, Reczek’s performance could be recreated, but CDPR made sure they got permission from his family. His sons were “very supportive” of the idea, according to a Bloomberg report.
I am pretty sure his sons are fans of CP2077 too. I would give permission too if I were in their shoes - getting a new character, or a different voice for the old character is annoyingly weird when you get used to it...