Well, if it is, Franz Welser-Most doesn't believe in literalism.
The Cleveland Orchestra did the Mahler 7 the day before at Carnegie Hall, and there the vast hordes (9) of double basses were prominently arrayed all along the back wall. Ideally situated to provide artillery support against the cowbells invading from the left.
(Sadly, the live cow I was anticipating didn't show up.)
There was also a 2002 Saariaho piece ('Orion'

(with a very nice middle movement). Only lukewarmly appreciated by the audience. (Saariaho may not be Ligeti, but the audience whoopings after the Mahler were in striking contrast with the at best polite noises (and at worst not even that - lots of people declined to applaud at all) following the new piece. Hmmm.)