אשר לא ידע את יוסף — דהוי דמי כמאן דלא ידע ליה כלל.
English: “Who did not know Yosef” — it was as if he did not know him at all.
On the daf / in context: On the view that the same king merely renewed his decrees, the phrase “did not know Yosef” is read as deliberate amnesia: he acted as though the benefits Yosef had conferred on Egypt never existed. The language is stronger than simple unfamiliarity.
Type of Learning
Custom — intensifying reading of “did not know.”
What Is Learned
Chazal teach that the new policy was not ignorance but a willful erasure of Yosef’s contribution to Egypt.