"or concepts whose nature is not elaborated upon".
All it has a specific area, and the type 2 concept itself is said to be bound by the object of the concept:
"These concepts, however, exist simultaneously with and are bound by the object of the concept."
The type 3 concept is "more specific" than the type 2 concept and type 1 concept, but, type 2 is already said to be "limited by the object in question", which means, that the "more specific scale" does not deals with area, in addition to the fact that type 2 is said to be almost the same thing, type 2 is also already accepted in numerous verses as a "concept of existence" regardless of the area that it reaches, the name of Yhwach was excluded from everyone who knew the name Yhwach, and I'm pretty sure it wasn't just one specific person who knew Yhwach, which totally refutes the "the type 2 concept and the type 1 concept must have an area greater than the area of the type 3 concept".
The difference, and that as the wiki itself says, is a "more specific" concept, and as we already know that this does not speak of a smaller area, it means that these are abstract and complex concepts, since it is also said:
"or concepts whose nature is not elaborated upon."
The source is a more elaborate and complex concept, and it also governs the body, mind and soul, therefore is one type 2 concept.