Kriekos your confusion is justified, many are. It is the small terminology that matters.
In general:
DH is typically associated with precision approach and for those the minima is expressed by RVR value only. For the ceiling you don't look at all. When the weather gets bad enough there will be an RVR value in the TAF, don't worry. Well, that is the point where you actually need to start worrying.
For NPA approaches, both VIS and ceiling requirements need to be satisfied, you know well how to work from there.
As experience, training, and opinions differ, I find the well intended guidance provided in #2 and #4 quite misleading.