Buddha's Dispensation (Buddha-sasana) is the time period which Dharma (Pali Canon) exist and follow. It is totally 5000 years after the Buddha's Parinirvana (pass away or "Skandha Parinirvana"). There are three types of Parinirvana those are "Klesha Parinirwana", "Skandha Parinirvana" and "Dhatu Parinirvana".
Parinirvana is something everyone understands right away. 
I honestly don't even have the slightest comprehension of what I just read, this is by far one of the most obscure pieces of information I've ever seen. Regardless, this is definitely incorrect based on a couple of key words I used; I said "everyone" (Buddhists are a small minority - common knowledge),and "right away" (any religion, regardless of region and intelligence, takes time to understand - certainly more than time than instantly). This is a perfectly reasonable conjecture, in my opinion. I think the system struggled because it thinks there is some realm of possibility that everyone in this world who has or ever will be exposed to Buddhist principles immediately will understand what they just read/heard. 