Sorry for the long delay in replying to your question. It took me a while to find the right person in house to answer your question. I've forwarded your question to this person and asked that they reply to you as soon as they can. Hopefully, we'll hear something from them soon!
Atiflash is developed and maintained by AMD. The revision history indicates the changes made in each version. However, the source you pointed out is not official source of Atiflash therefore it is not supported. The tool is not intended for end user, to get any latest version of flash tool, please contact your GPU vendor and see if they will provide you any update.