That's not how Cause of Death works. The specific complications of the zoster virus that typically lead to death are pneumonia and encephalitis. In other words, it's typically from inflammation of the lungs or brain. HIV/AIDS, cancer, etc. won't do that on its own. It's specifically from the virus due to a compromised immune system. If an underlying condition compromises the immune system, it's not that condition that killed them, it's the actual disease that happened to be more effective as a result.

For example, if someone dies from the zoster virus due to a compromised immune system from chemotherapy, you wouldn't consider that person died from chemotherapy or from cancer, you'd consider that person died from the virus _due_ to a compromised immune system from chemotherapy.

This discussion is absolutely bonkers. How can one person be so dense and not practice critical thinking? Your arguments don't even work on surface level intuition.

Everybody has pre-existing conditions, whether they know it or not, the cause of death is typically reported to be the straw that breaks the camel's back. People with chronic conditions often does due to acute causes, like contracting a virus. We often call this the cause of death.

If you're living with cancer and not terminally ill in hospice and die 2 weeks later after contracting COVID, you likely died of COVID.

They didn't die from cardiac arrest, they died from anoxia of the brain!

Can you prove it?