It's the observation that in all functionally integrated complex systems where the cause is known a designer is involved.
Nobody has observed the design of a biological system.
So if life is created in a lab, ID is established? The point is that the biological systems resemble known designed systems. The solution is to declare the existence of God (as Bacon did) then proceed from there. The stakes become much less culturally dangerous and much less time is wasted in silly arguments.
If we had done that a few centuries ago, we would still be believing that the sun transversed above the stationary, flat earth.
That's just plain not true. Biologically evolved organisms don't resemble human designd objects at all. At best, we have started emulating natural designs, but poorly.
Evolved designs are quite different from engineered designs. The differences are unmistakeable and obvious.