AFAIK, it's not the virus that kills most (liver infections - TBD), it's the pneumonia that follows and there are lots of treatments for that.
It appears to be survivable as long as equipment and personnel are available. And that's the problem: availability.
When health systems are overwhelmed, even people who could survive pneumonia with mechanical ventilation will die - because the equipment supply is exceeded and there are no ventilators left.
So yes, there are treatments for pneumonia, but they are limited in availability.