Was Surat Al Ahzab Equal to Surat Al Baqarah

Al-Zamakhshari said in his interpretation of Al-Kashshaf (d. 538 AH)

on the authority of Zarr who said: Ubayy ibn Ka’b, may God be pleased with him, said to me: How many verses do you count in Surat Al-Ahzab? I said: Seventy-three verses. He said: By the One by whom Ubayy ibn Ka’b swears, it is equal to Surat Al-Baqarah or longer. And we have read from it the verse of stoning: (The old man and the old woman, if they commit adultery, stone them both. It is a punishment from God. And God is Exalted in Might and Wise). Ubayy, may God be pleased with him, meant that this was among what was abrogated from the Qur’an. What is narrated is that this addition was in a document in the house of Aisha, may God be pleased with her, and a rooster ate it . It is from the fabrications of the atheists and the Rafidis because of their hatred of Lady Aisha, may God be pleased with her.