Not his style. Burtt invented actual Huttese for ROTJ. Even wrote a little book for the various Star Wars languages a few years ago. Now the jokers that have taken his place...
But the real problem isn't with the delivery but the dialog itself. The ANH Jabba is friendlier than the cutthroat ROTJ Jabba. Personally I've always liked how the radio drama repurposed that scene by replacing Jabba with his Mos Eisley contact Heater.