*** from neither native English speaker, nor linguist ***
It is sure in texts oriented for Russian-speaking students.
Pushkin is known to everybody since its poetry is must in the Russia's education system and he is unique
(I daresay he is a founder of the modern Russian language).
Dickens, though famous somewhere outside Russia, is not guaranteed to be universally known to every Russian and is just one of many (famous) writers.
Student or Learner