Exactly, so as an abnormally avid chocolate consumer, I'm still scared (and even more than before reading Arstechnica's take).
My new goal is to figure out how to get all this heavy metal accumulation out of me (I've been eating heavy dark chocolate regularly for years), and find ways I can keep eating chocolate without absorbing more. Some studies I've read mention that tomatoes might help prevent heavy metal absorption when consumed with the source.
The only good news about that is levels are constantly dropped as it gets "used up".
However this is only a portion, in many places arsenic is just there in the ground.