It seems weird. But it makes sense. Covid-19 is a culling virus that would have killed those who were ready to die. The reason the number of deaths would be lower than average is that many who did not know they had a medical issue were forced into the hospital or medical care environment.
The doctors would have then found and treated the medical issue which would likely have proved fatal within six months.
Doubt that?
Look at the column labeled HEART DISEASE -- 1,678 FEWER deaths in July.
Heart issues are seldom recognized before they happen.