Pound didn't get "Eliot's approval for his changes". Pound didn't make any
changes to TWL. He made suggestions which have been interpreted by scholars
as "editing". Eliot took the majority of those suggestions to heart when he
produced the poem "The Waste Land".
I was not enjoying some joke at your expense. Your comments implied to me
motives in Pound that I do not believe were part of Pound's complex and
troubled personality. Pound simply read and commented on a work of a
friend. He did this routinely and very often for a plethora of other
modernist writers and aspiring writers. His opinion was valued by most of
the early modernists and cherished by some.