I'm not really sure what all happened so I'm merely speculating here. He probably became extremely hypercapnic (increased serum CO2) due to poor gas exchange as a result of inadequate ventilation (the chokehold).
That's probably when all his comorbidities came into the picture. First off, he probably lives in the land of high CO2 to begin with. Also once the chokehold was released, you and I would've instantly began compensating and probably been just fine. Not him though. Those crappy lungs and that huge belly just won't allow him to breathe like he needs to in order to compensate. In fact, he just continues to get worse. He needs to be intubated to get that CO2 back to its normal level of just really high instead of the insanely high that it is at that moment.
Correcting the acute problem could be achieved in as little as 12 to 24 hours on the ventilator. Now weaning him off the ventilator may have been a challenge and possibly taken much longer, but that's a different story. The point is that he would've survived with timely intubation and mechanical ventilation.
He probably died within a couple of hours and certainly never regained consciousness.