They do not understand the brain well enough to do this, and I can't see them making such huge leaps and bounds in the next 20 years even. Sounds like a long time, but it really isn't. You might be able to record someone's thoughts in a very bare form - like images or sounds - if you trained a predictive model on people looking at shapes or listening to sounds. But that's a far cry from reproducing consciousness; they don't even understand the mechanism behind how it works in the brain. IMO, this is pure scifi at this point.