Most (all?) of the schools you list declined to participate (or were ineligible) in the Economist's ranking system this year it seems. Note that the last time they did participate, many of them were top tier. Harvard (2 in 2019), Stanford (8 in 2019), Columbia (15 in 2019), Wharton (5 in 2019), NW (4 in 2019), Chicago (1 in 2019), etc. etc.

https://whichmba.economist.com/ranking/full-time-mba/2021/me...