I think this just shows their spam filtering is not perfect. They delete lots of spam, in both English and Chinese, but some slip through.
Your comment seems to imply that the ONLY comments that are being deleted are the ones with the Chinese keywords. That is certainly not true. It tries to delete all spam, but the spam detection has both false negatives and false positives. That doesn't necessarily mean there is a conspiracy (doesn't mean there isn't, but provides no evidence that there is)
