So my decision to have a ham sandwich for lunch is determined by some meta-universe that created the starting conditions for this universe, and allows for the breach in causality? Or somehow is involved in the backwards-arrow of quantum events that the article talks about so the universe cannot turn out any other way?

I dunno, seems like a "God of the gaps" thing - we can speculate on meta-meta-universes endlessly. Including one where my decision to have a ham sandwich disturbs the state of a yet higher dimension that sets the starting parameters of your higher dimension and once again I have free will.

Right, physicists seem to generally agree there are parts or dimensions of the universe we cannot directly measure. If scientists can't predict whether you will eat a ham sandwich for lunch or not, it won't be clear if they can't predict it because you have "free will" or because we have limited access to information on how the universe works.