They are talking about the brain living to a certain point,6 minutes w/o oxygen for example; not indefinitely. It's in the article.

Good reason to have a back up battery wouldn't you agree

@Marine Many people felt that directly after an ultimate trauma, death is immediate. What the article is saying is "The research suggests a "step-wise shutdown," by which parts of us die gradually, at different rates, rather than all at once. " If our cells are becoming embryonic again and taking four or more days to succumb, that is both amazing and somewhat apprehensive as to what someone and science may come up with.

Thanks I have read about this in my science mags. but did not relate them to your post. Sorry.