OMG, who gives a shit, just look at it for a sec! Does this look like the imprint of someone wrapped in it? No; it looks like a flat rendition from the front, like a painting on a canvas.

So why should anyone care about the DNA on it? It's clearly a fake, of a fiction character I might add.

The fabric was likely made in India...

As such there's a bunch of DNA that can be traced to India, but also a shit ton from anyone that is around it up to modern day.

DNA is everywhere, and linen is basically a big net.

So human DNA being on it is 100% normal, and doesn't validate anything about it's religious claims.