I’m looking at my mother’s death certificate. It lists a proximate cause of death (dehydration) and an underlying cause of death (ovarian cancer), as well as the manner of death (natural).
The funeral director may have said something the family did not understand that statistics were being collected on Covid-19 positive cases, and proximate causes of death. If they notice patterns, like a rise in overall heart attacks in March-June 2020, and then look at the data, and see that 70% of heart attack victims during the period were Covid-19 positive, they will look further to see if the 30% who were negative had more risk factors than the 70% who were negative, so that the “negatives” were predictable heart attacks, and the positives were less so.
Well, then you start doing studies to see if Covid-19 directly attacks the heart in some way. If has huge implications for treatments.
The upshot may have been that if the SIL was positive, the family might be contacted in the future to ask about the SIL’s risk factors, lifestyle, and such.
I can see that, if the funeral was circumlocuting in order to try to make it not sound like she was being experimented on, he may have given the false impression that her specific case was still under investigation.