FL190 = 19000 feet. 9000 feet is survivable without pressurization or oxygen masks and this wouldn’t be a problem. Unfortunately, they were 10K higher.
The Cirrus SR22T has an oxygen system. Service ceiling is 25,000 feet.
https://cirrusaircraft.com/aircraft/sr22t/
Being above 10,000’ is not, in and of itself, debilitating and pilots do that all the time in pressurized aircraft.
In my T-37 we would routinely fly at FL25, breathing O2 through the mask.
19000? Why would that little thing need to be at 19000?