That figure is real hard to refute, or square with any other cause of reduction of measles infections except vaccination.
https://rootsofprogress.org/img/mckeown-1975-fig-6.png
Modern medicine and vaccines have undeniably reduced the occurrence and severity of diseases, but the occurrences of these diseases were already down over 90% by the time we came up with vaccines. It's not wrong to recognize that tremendous achievement.