Did any of you guys read the article? In the first few paragraphs:

"They’ve successfully analyzed the DNA of two naturally mummified livestock herders who died roughly 7,000 years ago in present-day Libya, which was part of what’s known as the “green Sahara.”

The article says they were practising animal husbandry - I'm guessing they have evidence for that!

So the question is not whether they did it, but whether they started doing it themselves or were taught it by others.