That's what you derive from the data? LOL!
Here is the valid conclusion that should be reached:
Nothing in that quote contains evidence that "natural dna" is designer by your god or any other entity.
It merely states that if humans would be capable of mimicing natural dna, we wouldn't be able to tell the difference between natural dna and human dna.
Which is true, off course, when stated like that. How that is supposed to lead to "therefor, there is no natural dna" is a bit unclear, to say the least.
Having said that....
I propose that this isn't entirely correct. If humans would be able to design DNA from scratch, and thus design
new species from scratch...
Then we WOULD be able to distinguish those creatures from "natural creatures".
How, you may ask?
Well, pretty simple actually:
those new, artificial, species would not fall into a nested hierarchy.
There would be no precursors to those genes. A sequencing of collective genomes would reveal no branching phylogenetic tree.
An artificially designed species without teeth, would not have inactive DNA to build teeth.
A species with no use for eyes, wouldn't have the DNA to build non-functioning eyeballs hidden away behind a thick layer of skin.
The distribution pattern of ERV's wouldn't match the general nested hierarchies we obtain by mapping the branching trees through comparative anatomy, geographic distribution, comparative genomics, etc etc etc (independently from one another!)
And I submit that that is how we could tell the difference between a natural species and an artificial species, if human technology got to such a level that we could design the DNA of new species from scratch.