So does the chart include those "unofficial" ND offers?
by Notra_Dahm (2019-02-06 12:00:54)

In reply to: ND does not offer players whose commitments it would not  posted by oneill3b

In other words, it seems that they are including they are doing so for other schools, which is the point of the article. I assume the large ND figure includes both official and unofficial offers. But perhaps the other schools are as clear. And perhaps NW and Stanford's data only includes what ND would consider "official" offers, which might explain the large discrepancy.