"For COVIDView, the percentage of total deaths occurring in a given week that had pneumonia, influenza and/or COVID-19 (PIC) listed as a cause of death is calculated. PIC deaths are identified based on ICD-10 multiple cause of death codes J09-J18.9 or U07.1. PIC is being monitored in order to provide a more accurate representation of COVID-19 related mortality than would monitoring COVID-19 alone. Deaths due to COVID-19 may be classified as pneumonia deaths or influenza deaths (deaths due to “flu” or “flu-like illness”) in the absence of positive SARS-CoV-2 test results. The combined PIC categorization also prevents double counting of deaths"
The death rate from Covid-19 includes deaths from other causes that have similar symptoms. The reasons for this are good, it's very difficult to identify between these diseases and lumping them together probably gives a more accurate result than relying on confirmed cases. There's no malice here, it's just a very difficult problem to work on, but it's also a methodology that should be likely to give a high side estimate. Then from there, they calculate excess deaths [1], which I was able to find through your link (thank you). Outside of New York/New Jersey and Massachusetts, I don't find a high disparity in the excess death ratio that supports the idea that there is significant under reporting of deaths.
You can find cause of death vs year on their charts at [2] and most of the excess deaths are from cardiac arrest or dementia. Now, that could be caused by Covid, except if we go to New York where Covid has been by far the worst in the US, you see a huge jump in respiratory deaths directly lining up with the peaks in the reported Covid cases. So are more people having heart attacks? Is Covid causing heart attacks? Are people unwilling to get treated at hospitals for heart attacks because they are afraid of Covid? These are unanswered questions and it could go any which way from what I understand. The data appears to be out, and I think it will be out for a while which is why I don't feel comfortable pushing the idea that we are under-reporting deaths or over-reporting deaths because I think that we don't actually know.
[1] https://www.cdc.gov/nchs/nvss/vsrr/COVID19/index.htm [2] https://www.cdc.gov/nchs/nvss/vsrr/covid19/excess_deaths.htm...