Daily data on the other causes of death isn't likely to fluctuate much day-to-day except for influenza.
The total deaths for heart disease in 2017 was 648K (just going by the graphic) which is higher than current estimates for COVID19 deaths in 2020 given current measures in place, so in that regard, the chart is misleading.
Also, a breakdown by area/zipcode would be interesting as well.
would percentage of total deaths be a better way to describe the relationship?