Don't the Chinese like Linux?
Perhaps the Linux users self identify as Windows so as to not stand out. I would do the same if I knew my internet traffic was scrutinized as closely as theirs is.
really ? will you run windows version on linux ?
Those stats are based on the brower's user agent, not which OS the bitcoin executable is compiled for. That looks like the stats for one specific file, not the whole project. Since the Windows numbers are so high, I'd guess it's the exe, not the tar.gz.
Linux downloads are tough to get a count of since many people get it from their distro and many compile it themselves from git.