Use of the slur "Chink" is clearly racist. I have looked at the site and I may have missed it, yet, I don't see where that word has been used on the site. IF that term is used, then I agree the intent of that term is derogatory. But, the site in whole, I do not think has racial tones and themes. The site itself is quite funny.
The real people that need to be asked are oriental peoples. Of course, they would most likely think so. Given that I can not speak for all such people, I can not speak for all. We live in the United States of the "Offended". Someone will eventually, if it has not occurred, find it offensive.
I have an oriental co-worker who is funny as hell. He walks out and uses his fingers to open his eyes wide and always makes fun of my accent and asks if he could have a Big Mac.
I always respond, when you wok my dog I will get you a Big Mac.
No one gets offended and we laugh it off, and it's all good.