OK, to spell it out a bit more clearly. It would seem to me that if scientists create life where none was before and where none exists without intervention, then that is a demonstration that intelligence creates life. Your rebut is not on point.
"If we create silk in the laboratory, does that mean it isn't made by spiders? If we model the workings of a volcano in supercomputers, does that mean volcanos are designed?"
It demonstrates that humans can analyze and mimic a natural process.
The actual interpretation of your scenerio would depend on the specifics. Are the laboratory conditions consistent with known facts about the history of the earth?
Unfortunately, the details of earth's early history are erased by time. We probably cannot reconstruct anything better than a plausible scenerio that is not contradicted by known facts. That is not the same thing as knowing the actual history.
The study of other planets may give us information about what happens in various environments.
What I dislike about ID is that it denies the legitimacy of this kind of curiosity.