Part of the issue here is about exactitude rather than certainty.
If you create a profile for someone born in 1830 but as yet have no idea of the date of death, you'll likely leave date of death blank and choose the status indicator "about/uncertain but non-living".
If you later find the person died during 1870 but not the exact date, for example from a death register index without seeing the full death certificate, you'll enter "1870" in the field. This is certain as far as it goes, but it's not exact because it doesn't have month or day.
You may therefore consider "exact/certain" (and all other status indicators) inappropriate, and want to unselect all values again, pending eventual discovery of the precise date.