I mean I barely know about pacemakers. Just that I have a congenital heart condition and will need one in a decade or so, and have taken a hobbyists interest in learning about them/ following the field. Just the level of arrogance and just completely wrong "facts" astonished me. The bit that moves is a few strands of hair thick. In what world does "I built my own keyboard" translate to "I built my own keyboard so how much different could a pacemaker be?"