I think years of life lost would be a fairer metric. I think the word 'natural' is ambiguous; I mean, Covid-19 can be considered a natural death since evidence shows that SARS-CoV-2 arose by natural evolution.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7345973/#:~:text=Only%201.1%25%20of%20the%20deaths,group%20of%2060%E2%80%9369%20years.