You present a false presentation of the argument. The true argument lies in the assertion that complexity cannot arise spontaneously. If life on our particular earth could not have arisen except through design, then how did the designers arise?
Moving the origin of the designers back in time doesn't help, since the earth has been around for a large fraction of the age of the universe.
Moving the designers to some distant planet doesn't solve the problem of their origin.
ID is stealth creationism because it requires complex life to be made by an unmade creator. The designer cannot be a living (biological) being.
That was my complete statement. I don't post it because I think you left any significant part out. I simply want to make a point.
I truly am NOT a libertarian. And I truly AM a conservative. At some point, I get to assert my own affiliations and my own beliefs. Others are free to dissect them and say "Y is close to Z, therefore there are many traits of Z present." That's their right. They can analyze and dissect all day long....but I'm not a libertarian.
Likewise, the fact that a "Designer" has to be accounted for doesn't make me a "creationist."
It seems to me that you really DON'T have to find the identity of the designer for a designer to have brought about life on earth.
I can see TOTALLY non-religious people concluding that a "designer" guided the development of life on earth.