The thing with mortality reports during
any outbreak is that it is hard to get accurate numbers between:
1) "died of X but were undiagnosed at the time of death"
2) "died of Y but were suspected to carry X at the time of death"
3) "died of Y but were confirmed to carry X at the time of death" and
4)" died of X and were known to carry X at the time of death".
True figures only become clear in the aftermath, with retrospective analysis. For instance, immediately after the 2009 Swine Flu pandemic, the confirmed death toll was around 18,500, but once undiagnosed cases were taken into account the WHO adjusted this figure to around 575,000.
At the moment, reports are including the latter three categories but not the first category (for obvious reasons)..... but the factor which has a bearing on this specific question is the fact that it is hard to prove whether or not someone who died due to a non-Covid19 reason, but is suspected to have been carrying Covid-19 (even if asymptomatic or only mildly symptomatic) would have lived or not in other circumstances. Someone with an undiagnosed heart defect may catch CV-19, and this may be enough for the defect to kill them - Covid-19 wouldn't necessarily be the cause of death, but it is possible the defect would have never killed them without the presence of the virus.
Once this storm has passed, it will be possible to work out how many "avoidable" deaths from non-CV19 causes are included in the figures (these would be retained) and how many would have occurred no matter what (these would be removed), and also how many undiagnosed deaths occurred and need to be added to the total. From what
@Brum says above, his grandmother will end up being classified in the middle category and will be removed from the official total in time.