I strongly disagree. It's clear from that film that the kangaroo employs a variety of old-school techniques that are no longer seen among modern 'roos. Observe the subtle shoulder feints and up-and-down footwork. Also, this kangaroo's old-school combination of abuse and starvation have made it much more athletic than modern kangaroos. Screw "progress"! Watch how smoothly Carnera slips into and out of range against such a tricky opponent. It's fights like this that give you a glimpse of what Carnera would do against the overweight slobs in the modern kangaroo heavyweight division.
I like the way that kangaroo pulled a Golota on Carnera, with his feet, at the end there! I heard Carnera drew the species line and refused to give him a rematch, too!