I have the DVD of Zinman's M6 documentary, titled "Going Against Fate". It's certainly part infomercial too. It's a lot of fun, with lots of shots of cows, alpine scenery, big cowbells and, of course, the wooden hammer business. I'm not sure I care for Zinman's own input that much. However, all I care is that he conducts the piece well.
"Going Against Fate? skirts the "Alma" business, for the most part. But on the other hand, neither is there any attempt to explore the juxtaposition between Mahler's Alpine based heaven, and the stark realities of a unified Germany and the escalating militarization of Europe in general. If anyone still believes that the finale of M6 is nothing more than an over-sized expression of Mahler's personal insecurities and doubts over his marriage to Alma, you need to study the first version of the finale in detail.