Somewhat clickbait:

process is imperfect and clearly doesn't work the same way every time the companies run the tests, he said — though the errors aren't hugely significant.

I'm with your assessment. I was expecting to see more than the minor differences that were reported, which would have made it more interesting and damning to the processing firms. But a headline like "I took nine DNA tests and got approximately the same results" wouldn't have generated so many clicks.