Vyapaka Dasa: “Do you have explicit instructions from Srila Prabhupada authorizing you to make post-samadhi changes to his books?”
Jayadvaita Swami: “No.” (Published e-mail correspondence between Jayadvaita Swami og Vyapaka Dasa)

Govinda Dasi: “…Jayadvaita Maharaja has said that Srila Prabhupada did not specifically give him the permission to…”
Jayadvaita Swami: “I never got an explicit word from Srila Prabhupada to do this work at an explicit time.” (Conversation between Govinda Dasi and Jayadvaita Swami about the posthumous changes to Prabhupada’s Bhagavad-gita, Honolulu on Jan 19, 2003)

“To my knowledge, Srila Prabhupada never asked us to re-edit the book.” (Jayadvaita Swami’s Letter to Amogha Lila 1986)

“Dear Yasodanandana Prabhu,

Please accept my humble obeisances. All glories to Srila Prabhupada!

In answer to your questions, I don’t have any original tape recording of any kind of Srila Prabhupada authorizing the editorial changes in the Gita. And despite scouring the GBC resolutions from 1979-83, I found no reference to the Bhagavad-gita whatsover. It seems the assignment of Jayadvaita Swami to perform that task was unpublished–at least I couldn’t find it in the GBC resolutions made widely available.

Hoping this meets you well, I remain

Your servant,
Dravida dasa [Editor for the BBT(I)]” (Letter from Dravida Dasa to Yasodanandana Dasa, Date: Wed, 24 Apr 1996 09:45:12 -0700)

So both Jayadvaita Swami and Dravida Dasa, who are the leading editors for the BBT International admit there is no instruction from Prabhupada to edit his Bhagavad-gita As It Is (or any other of his books).