1. how can this be price manipulation when everyone get same amount of information and they probably aren't false
2. rarely any foreign BTC exchange accessible by Chinese people because most Chinese people don't have visa/master card but only those cards of their country's system. That's why it cause problems. If people can in China can trade in USD via MtGox then the whole thing won't happen. Only exception I noticed is BTC-E that cooperate with China paying channel but still it seem difficult for Chinese users to take money out of them.