This is an interesting point
I think for direct comparison, the way of re-animating the brain described in the article would need to be attempted on the cardiac arrest patient as well so as to be sure it isn’t a “revival”-capable method
Might already be an obvious answer to practitioners in the field
My understanding is that after a few minutes without oxygen, the chemistry inside your brain is "fucked up" and even if you get oxygen back it's gone, you're already a vegetable. I like to think that "the state of the machine is gone" but I'm not a doctor