absurd = illogical / foolish
catchall = generalising / sweeping
absurdity = stupidity / foolishness / illogicality
vacuous = mindless
gibber = rapid and unintelligible speech / gabble
Using the above, in my opinion the sentence means:
"Not in some illogical sweeping stupidity of mindless gabble".
Is that similar to your thoughts on it?
Interested in Language