Well even Nancy Baker (the author of the study they cited) did not claim that the ergonomic keyboards do not help preventing heath problems. Only that people who had pain mostly got rid of it over time regardless of what keyboard they continued to use. My guess would be that they improved posture and took more breaks.
I assume the other woman in
this video is a participant of the study. If so then how the hell can she type with such a long fingernails?
Or Nancy claims that split keyboard improve wrist posture but make knuckles posture worse? I do not understand how that could be.
Maybe there are studies which claim that ergonomic keyboard is better. Jacobolous could know. He seems to read a lot of research.
Of course, das keyboard does not sell an ergonomic keyboard. They may want to make people feel better when buying a non-ergonomic das keyboard.