Logically, it does not invalidate intelligent design. Using your summary "incomprehensible outputs can only be generated by incomprehensible inputs" this sort

Logically, it does not invalidate intelligent design. Using your summary "incomprehensible outputs can only be generated by incomprehensible inputs" this sort of thing only proves that an incomprehensible is not a necessary condition. To truly invalidate intelligent design, you would need to exhaustively show that incomprehensible inputs never yield incomprehensible outputs. Ninja edit: The sort of reasoning you discuss does strengthen the basis for evolution by natural selection, as it indicates that comprehensible inputs can yield incomprehensible outputs. This is all in the realm of logic, not observed evidence supporting one view or the other.