I don't see what evidence this event gives to either side, intelligent design, or Darwinism. (you'll notice that I prefer the word Darwinism, has less baggage. There are multiple types of evolution, and evolution doesn't have to be inconsistent with design.)
The cell was created by an intelligent person, using already existing code. Therefore this doesn't show that life can arise from non-living matter. It hasn't evolved into something more than what it is yet (and they obviously don't expect it to, since they included watermarks, which would be distorted in the case of a mutation) Therefore it doesn't support Darwinism.
If anything, I see that it took our intelligent species years to be able to replicate a very basic cell using coding that already existed and was already known, while an Atheistic Darwinist theory would suggest that such an event could have occurred by complete random chance out of non-living matter.