I also came across this howler from the otherwise respectable Deems Taylor: "Someday, some real friends of Mahler's will take a pruning knife and reduce his works to the length that they would have been if the composer had not stretched them out of shape; and then the great Mahler war will be over... The Ninth Symphony would last about twenty minutes."
Name one work by Deems Tayler (?). I know I can't. "Howler" indeed.
By and large, this reduction of M9 seems to have been very carefully done. Obviously, the excerpts for the 2nd and 3rd movements will sound less 'foreign' than what we hear in the finale - which is where one would miss the bigger, fatter string sound. In my opinion, I think that string sections are sometimes too 'big' in Mahler, which forces the brass to not make clear distinctions between mezzo forte, forte and fortissimo (gradations of loudness, in other words). One reason that I'm not always so crazy about the Berlin Phil. in Mahler, is that their powerful strings actually drown out wind detail that should register a bit more sharply. Obviously, the 9th symphony would be a major exception to that, particularly in the two outer movements (Mahler divides his strings into many different 'strands' in parts of the first movement, for example). But by and large, I prefer the Concertgebouw, Czech Phil. and N.Y. Phil. approaches to Mahler, with their greater emphasis on woodwinds and percussion, and a tad less on strings and brass (that said, the N.Y. brass are pretty muscular these days - partly out of necessity to 'over-take' the acoustics in Avery Fischer).
I don't know, I always have mixed feelings about these efforts to make Mahler more intimate. I admire what they do on the one hand. But the other hand, I don't particularly want to hear Mahler played this way more than once. I generally believe that Mahler knew what he was doing, regardless of what Deems Taylor may say. I also think that the 'reduction' for DLvdE could be a whole better than it is without having to add very many more players.
Still, I hope good fortune to the people involved in this project.