KateWild,
I think the problem is you're only acknowledging the part of the paper that discusses how scientist in the past have achieved the process and you're ignoring the parts that show it can be part of a natural process. The paper specifically shows how an organic system - without the need of an outside catalyst - can form a homochiral solution. It can happen without outside interference. Thus, in specific circumstances, an "intelligence" is not required.
Just because something can be done by intelligent beings - doesn't mean all examples of that thing are therefore the product of intelligent beings. For example, sometimes intelligent beings sculpt rocks into things that look like elephants:
And sometimes blind forces of nature will sculpt rock formations into things that resemble elephants without any outside help.
No intelligence required.