And THAT statement makes sense if humans are the only tangible bodies capable of possessing the attributes of intelligent design. Even certain turtles know how to make homes for themslves.
Read it again. How much evidence do we need to conclude that intelligent design is present and operative in the universe? Do we need proof that humans created the universe to conclude there is such a thing as intelligent design? No. A hypothesis like that is more like a given. It only restates the starting point for all science, namely that science cannot take place without intelligent design.
I was trying to be more thoughtful in the second paragraph, because I think it is proposing hypotheses that may indeed be untestable, and I think that is more along the lines of what you want me to do.
P.S. Please do not infer "intelligent design" as a proper noun in my posts unless I designate it as such by capitalizing the words.