Even yourself already used the word "if". You should ask yourself what happens if the company is a fraud. Are you prepared to take a huge loss for this position? As long as the downside risk is acceptable for you, you can always feel comfortable to hold XIN.
There is always a possibility that the company is a fraud, but the more I look into it, the more I feel the likelihood of it being a fraud is very very low. I'll buy more if stock price falls, I have the patience to ride it out.