https://www.bfi.org.uk/sight-and-sound/greatest-films-all-time 

i didnt look it up but read in a thread mostly filled with derision that the 1600 person voting body just submitted a list of 10 movies in no particular order. so it is an aggregate award. it was suggested it ranked so high as it became the go to "lets throw in a movie by a female director" among our nominees. i think in the previous iteration it ranked somewhere in the 30s which is still notable.