This forum is about wrong numbers in science, politics and the media. It respects good science and good English.
The writer is an economics editor.
"up to two-thirds of premature deaths would be prevented."
Mean age of death might be different; but, 50% of the deaths would still be pre-mature.
The earlier report from NATSEM found that if people in the most disadvantaged areas of Australia had the same death rate as those in the most advantaged areas, up to two-thirds of premature deaths would be prevented.