Because they're still treating them in some regard(before being overwhelmed). However once things get even more overwhelmed, you have bad cases become critical

Because they're still treating them in some regard(before being overwhelmed). However once things get even more overwhelmed, you have bad cases become critical leading to more fatalities. The going figure seems to 20% are badly impacted, with 5% of that critical. Some of that 15% will become critical without treatment that might not be available. Thus impacting people <70.