See, for instance, the conversations in this thread with figures like Henry Ford, Ronald Reagan, and Lyndon Johnson: https://twitter.com/ZaneGTCooper/status/1615577714836275200
That's the other problem with the theory of understanding historical figures by chatting with them: even if the simulation was realistic or we were able to reincarnate the actual historical figures they'd lie, dissemble and make excuses a lot...
This means that for most cases the personality disappears.