Chris Cuomo's "You've got to breathe deep when it hurts" is a lie.
Breathing deep "when it hurts" might actually succeed in spreading the virus to other parts of the lungs that aren't currently infected. Breathing deep when it hurts is NOT what you want to do.
Also, I would not trust "ventilators" from China. I would not put it past them to send tainted or infected equipment.
COVID-19 is a condition that depends on "volume", meaning the greater the amount of the coronavirus you were initially exposed to, or the greater the spread of the virus in your body, the more chance it has of succeeding in overcoming your body's immune defenses.