This might not be a case of intentional dishonesty by AIG. It's quite possible that this statement is just a matter of ignorance about how living populations work.
"But is this really evolution? No, because kangaroos remain kangaroos. No new genetic information has been created"
Because the guys at AIG have no idea what genetic information is, or how it changes, they might actually believe this statement. In fact, every new mutation in a population increases information. And in some cases, evolution would actually reduce information in the process of producing a more fit genome.
Example of how information changes in populations, on request.
I am aware however, that Ham knows what the scientific definition of biological evolution is, so he is obviously being deceptive about that. Clearly the allele frequencies in the two populations have changed, resulting in slower maturation for young kangaroos.
Just what Darwin's theory predicts.