Earlier quoted context omitted.
I think looking at the last 20 years is pretty reasonable. All the years are within my lifetime. I agree we should not zoom out for the last 200 years. If the data only looks bad when you look at 5 year window, and not 20 year window, that seems like a pretty fragile argument.
What problems have had advancements in treatment in the last 20 years? HIV/AIDS, cancer, diabetes. Those are just three things off the top of my head that I know have improved, even without data to support me. I'm not sure, with the speed of technological improvements in the last decade, that 20 years is appropriate.
Seems appropriate to me.