Your analysis of Houbi's trading activity is spot on. Do you happen to be able to read/write mandarin?
No, what I know about Huobi is basically from sources in English, e.g.
http://forexmagnates.com/exclusive-interview-ceo-of-largest-bitcoin-exchange-in-the-world-huobi-responds-to-mt-gox-situation/http://www.csmonitor.com/World/Asia-Pacific/2013/1206/Why-the-Chinese-can-t-get-enough-of-Bitcoin-despite-bank-banThere is most definitely no validity behind "fake" volume coming out of those exchanges.
Well, it is hard to tell what the volume means, at any exchange. The plots of BTC-China or
Kraken Bitcoin.de, for example, are quite weird.
I would consider legitimate (i.e. not "fake") any transaction between competing people or organizations, whether it is done manually or with the help of scripts and robots. Any such transaction contributes to define the true "market price" of the item. To a first approximation, it should not matter if the same coins are being traded back and forth many times, or how many distinct people are trading, as long as each transaction happens because both sides believe that the price is good. To me a transaction is "fake" only if the buyer and seller are the same, or are colluding outside the market place.
Methinks that the volume of legitimate transactions is a good measure of the importance of a market.
The higher the volume, the higher the liquidity and the smaller is the spread, therefore the price is pinned down more accurately. At BTC-e, forexample, the price often is bouncing rapidly up and down by a few dollars, so that the 1-minute plot look like a broad belt. You hardly see that at Huobi; the plot looks more like a line than a belt.
Usually, the higher the volume, the smaller is the effect on the price of buying or selling a fixed amount of coins. Therfore, arbitrage trading between a high-volume market and a low-volume market generally has little effect on the price of the former, instead copies the price to the latter. For example, I would guess that the sharp steps one can see in the 1-minute plots of BTC-China and Bitstamp (but not on Huobi's), at periods when there seems to be little real activity, are arbitrage transactions aligning their prices with the global market.
For all I have seen in the past 2-3 months, I believe that most of Huobi's volume is legitimate in this sense. At the other exchanges, I am not so sure; but even if it is all legitimate, the volume at non-Chinese exchanges is only 1/3 to 1/4 of the volume at Huobi and OKCoin. Whatever one may think of the "quality" or "meaningfulness" of their trade, it counts the same for the definition of BTC's price.
Also I do not think that there is any government interference with the bitcoin trading inside the exchanges. My understanding of the news is that the PBOC, having blocked the use of BTC as a currency in commerce, and prohibited banks from playing with it, now sees bitcoin trading within the exchanges as a kind of gambling, and therefore does not care about it at all.
It may not be a pleasant conclusion for non-Chinese bitcoiners, but it seems undeniable that bitcoin trading is now largely a Chinese thing; specifically, that the price of bitcoin is now largely determined by the Chinese traders at Huobi and OKCoin., and carried to other exchanges by arbitrage.
To me, the thought that BTC is growing to be largely a Chinese "thing" automatically raises concerns over future of innovation in the space and the underlying utility of the tech from a global perspective. Let's face it, China is not the world leader in open innovation policy.
Note that I said "bitcoin
trading", not "bitcoin". Bitcoin development and other activities (such as promoting its commercial use) seem to be mostly "non-Chinese things". Given the restrictions on use of BTC in China, I do not expect that there will be any significant development or advocacy there, except perhaps in mining technology.
EDIT: BTC-e --> Bitcoin.de