If a 80 years old dies from heart attack and is tested positive by covid19, it will count as "dead by covid19".
The numbers we see in the news of "CFR" for the covid19 are, in my opinion, inaccurate. The number only shows the spread of the infection, not its actual fatality rate.
CFR doesn't translate to the additional death rate, but it does contribute to the death rate by unspecified amount. In particular high enough CFR directly translates to the additional death rate when it exceeds the original crude death rate.
The mayor of Bergamo, a city in northern Italy devastated by coronavirus, said on Monday that the actual death toll from the pandemic is likely several times higher than official count.
Giorgio Gori told NBC News on Monday that the total deaths in Bergamo are three to four times higher than during an average year, signaling that the virus is killing many more people than medical authorities have reported.
"We [have] evidence now in our territories that many people are unfortunately dying in their homes or in the residence for [seniors]," Gori said via Skype. "They are not officially tested because the test is only for people that go to the hospital with serious symptoms."
You can only extrapolate so far.