well PH was more punkISH than any of their other albums, espec songs like ripcord and how do you
anyway i think he wants words to sound ambiguous and like entirely different mixed-up words, he also slurs in contextual ways like I remember him slurring 'choke' on exit music; sounded throaty like he was choking..live version I think
oh and he most def uses fx gear/sw to slur his voice but it can sound quite natural at times