It's good that the situation has not graduated to a place where automated hand bag ventilation was required. That would have definitely been a desperate spot.
Mechanical ventilation has gone through a few generations and I believe the most advanced ventilators are now using turbine compressors for positive pressure (or at least the most advanced anesthesia machine ventilators do
AFAIK). Sick people require advanced ventilation techniques. While bellows and pistons were leading edge at one time, technology has advanced.