I think that Jed Distler is referring to this performance:
Gustav Mahler / Symphony no. 8. Part 1, Hymnus: Veni, Creator spiritus
Carol Neblett, Judith Blegen, Jann Jaffe, sopranos ; Isola Jones, Birgit Finnilae [i.e. Finnilä], contraltos ; Kenneth Riegel, tenor ; Ryan Edwards, baritone ; John Cheek, bass ; Glen Ellyn Children's Chorus ; Chicago Symphony Chorus; James Levine (22:36).
(check disc 5 of the collection "Chicago Symphony Orchestra, the first 100 years":
https://searchworks.stanford.edu/view/728542)
I do not know where it was recorded. Ravinia is not mentioned in the following list (which I do not know if it is accurate):
"Recorded from live performances, radio and television broadcasts, May 1, 1916, to June 30, 1989, in New York, N.Y., Chicago, Ill., Hamilton, Ontario and Evanston, Ill."
Anyway, if according to Distler's ears it is a fabulous performance, I am inclined to believe him.
About the Levine cycle, I concur with the reviews one can read on arkivmusic:
"As a Mahler interpreter, his performances are exciting, fabulously played, razor-sharp rhythmically, and sensitive to the myriad details of Mahler's scoring. He has terrific vocal soloists--Judith Blegen in the Fourth and Marilyn Horne in the Third--but seems not to like cowbells very much in the Sixth and Seventh. Perhaps the two standout performances are the Fifth and Ninth, as much for the playing of the Philadelphia Orchestra as for Levine's intense interpretations."
(for the full reviews:
http://www.arkivmusic.com/classical/album.jsp?album_id=565592)
And so I think Levine's Mahler belongs to every serious collection.