I cannot read the links you provide, but I believe you are referring to the digital noise seen in photos taken in the dark, especially at high ISO and long exposures.
These are not uncommon problems, often seen in cameras with small sensors, especially in superzooms and high MP cameras. In the dark, the camera usually uses high ISO to increase its light sensitivity, this will amplify the digital noise. Superzooms have additional problem of having less light reaching the sensor as you zoom out further, thus worsening the noise problem. Packing in more MP in a small sensor will decrease pixel size and also increase noise in low light.
Digital noise does come from the circuitry of the processors. The answer you get from Fujifilm is not unreasonable. The electronic circuit of the sensors have certain amount of electrical noise. In addition, the heat generated from the circuitry or in extreme ambient conditions can free electrons from the sensor circuits and "contaminate" the photoelectrons from your image. These free electrons and electrical noise got mixed with the photoelectrons of your image, and they both generate analog signals which are then converted into digital pixels by an Analog to Digital (A/D) Converter. Since the free electrons are not part of your image, they become "noise". When light is low, the signal is weaker and needs to be amplified, thus the noise get amplified with the image. Thses noise can appear as "snowflake" in your images.
Each manufacturer has its own way to deal with noise, so the noise will appear slightly different among different cameras. Larger sensors will have less noise. Lower MP usually means larger pixel size, and will also have less noise.
To minimize noise or snowflake, you can pick a camera with larger sensor, fewer MP. You should also use the lowest ISO setting, largest aperture, and do not zoom out. When there is not enough light, use flash or external lighting.
The noise problem is universal to all cameras, especially those with small sensors, high MP and have long zoom range. They are not unique to the Chinese Fujifilm cameras. You have to have some realistic expectations of what your camera can or cannot do.
Please allow me to say "Hi" to all the members of CENT, thanks.
Recently, numbers of Chinese users of Fujifilm S205EXR, have found that there were snowflake in the photos that taken in the dark with long time exposure(1 or 30 senconds at random, ISO 100 or more). The snowflake can not be found in other brands' cameras!
China Center TV (CCTV) has broadcasted this problem, please see the following link: http://www.tudou.com/programs/view/eQOT931uPx4/.
These users have also fed this phenomenon back to Fujifilm China Ltd., but got a ridiculous answer from its official website "http://www.fujifilm.com.cn/about/news/news_detail.php?ArticleID=2354"on 24th of June, saying that:
"This phenomenon is caused by high temperature, and it is a reasonable feature of CCD, named Hot Pixel! Furthermore, one of Fujifilm's engineers even gives such suggestion: the users should use a piece of cloth or a tool with stannum cover to prevent the sunshine when they take photos in the sun!!"
Friends, have you heared of this before? We suppose your answers must be "never". So more and more users in China become resentfully. One of the users suggests those people who use Fujifilm's cameras should carry a icebox to cool them down!
And now in Chinese most authoritative electronics forum Zhongguancun On Line, more than 200 users have written a letter to Fujifilm China Ltd. in joint names, asking for recall the cameras with snowflake. Please see the following link: http://dcbbs.zol.com.cn/69/752_683093.html.
After discussing in the forum, the users find that almost all Fujifilm cameras that adopt Super CCD, exist snowflake, no matter they are used in high temperature or indoors!
Me, a new owner of S205EXR, just purchased for one month, found the snowflake in the photos! I feel sad and lose faith in Fujifilm now, because of their ridiculous answer and response! They are fooling Chinese users now!
I swear to God, all my words above are true and stand the test!
Hopefully, what I said is useful to you all.
Thanks and best regards,