As far as I can tell, that article says that there have been no studies of the ergonomics of alternative layouts, in contrast to hardware changes, which are well-supported. It does say that dvorak and others were designed by people who knew about ergonomics.
As far as I can tell, that article says that there have been no studies of the ergonomics of alternative layouts, in contrast to hardware changes, which are well-supported. It does say that dvorak and others were designed by people who knew about ergonomics.