"The result is the state’s death total will decline by 3,700. As of Wednesday, the state had reported 22,944 deaths, a number that will now be decreasing."

So a 16% decrease. That seems pretty substantial if it carries over to totals reported across the US.

Not if they are doing it to make it the same as the rest of the US as is also implied in the article.

> “The revised definition for COVID-19 deaths is a reasonable balance between sensitivity and specificity and will make it easier to compare Massachusetts death data with data from other jurisdictions.”