God made Jesus in a fully functional way, like every other human. This, presumably, would have included full DNA, etc. I have no idea what such a study would have revealed, but I believe it would only have revealed what a normal human would have in order to function as a human. So, this would not be deceptive in the least.
Very often, miracles require functionality, that is understood. And if God had created a universe which was "in maturity" or functionality, that would be another story. But then the universe would still, in many ways, TEST young even though it "looked" old (mountains, light in motion, etc). But there would be no reason to create materials with half-lifes of millions of years, or create "false" craters, or embed materials into the earth that don't need to be there, etc. In fact, the earth would be pristinely "young" other than those areas needed be "developed".