Check your facts before you put them in print. Obviously the writer hadn't heard of ligers or tigons before Napoleon Dynamite, saw the term "tigon" and assumed that liger must be wrong. Ligers might have been made popular by Napoleon Dynamite but they are different from tigons.
Tigons are the offspring of a male tigers and lionesses.
Ligers are the offspring of male lions and tigresses.
Also, tigons only grow to be about the size of a female tiger where ligers are the ones that grow to be huge. Hence the reason why Napoleon says, "[Ligers are] pretty much my favorite animal. It's like a lion and a tiger mixed... bred for its skills in magic."