That would be no more significant than when I was a kid and cut and pasted hexadecimal code to crack a game...although I did it, did I know what the hex code represented?
Likewise: Do the scientists truly understand the DNA they're cutting and pasting?
Or are they merely playing with materials that, yes, they can manipulate, but cannot understand?
Are they just kids eagerly taking credit for something they really don't understand?
A poor analogy might be this: I understand how to create fire. I know what it will do once I create it. I know its heat, its light, and how to propagate it--or, more likely, avoid propagation!
...but do I understand what the FLAME ITSELF is made out of?
I believe you're moving the bar. You asked if anyone could prove that life could be made from non-life. I gave you one example of how this might be done.
And what's to understand about DNA? It's a simple organic polymer. You know. Plastic.