And so you’ll assume it was correct, even though those people may have checked and found the pastor was making it up? Or may not have been Chinese, but Malayan?
Incidentally, this is a very old claim, that most here will have heard amd looked into before. You should look at claimed refutations too, such as here, here, here.
Not definitive, but at least interesting possible evidence of a historical world-wide flood and migration for what would become the Chinese culture soon after it. I was looking it up afterwards and it was on a couple of creationist websites too so now @PDPrice will probably link you. 
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