Towards the end he says that where the ultrasound beams converge, they heat up the "abnormal cells" and kill them---when did cells become abnormal? How can they tell which cells are abnormal and which ones are not?

I have never read anything about PD that said any cells were "abnormal", only that a protein (a-syn) could misfold and cause clumps (which they find on autopsy)...does anyone know anything about this or did the man mis-speak?