The normal process of becoming immune to anything will changing the memory T cells inside of a person's body to produce an immune response quickly enough so a person doesn't end up with virus symptoms or transmit the virus to others.
If the vaccine is effective, that's what it's supposed to do.
Getting the virus and obtaining immunity to it that way will also change your body on a cellular level, and possibly cause greater amounts of cell damage then the vaccine. Viruses destroy cells to replicate themselves. That's how they work.
It's possible this man had a pre-existing condition. An actual doctor I listened to said that this virus attacks the blood vessels, and if you can't get enough blood to organs they shut down. I don't know about @Micah_Wellpride's pastor's case, but it's possible Covid contributed to this man's organ shutdown.