Hi Physixfan,
It could be that the feed validator have trouble with the Chinese characters, but I am not super sure about this. Does MailChimp tell you your feed is invalid?
In any case, this is not something directly related to this plugin as the plugin itself does not modify your feed in any way. It looks like you’re using some kind of translation plugin to handle multiple languages, I’d ask the author of that plugin to see if he knows anything about the invalid feed.
Otherwise, can you try ignoring the validation errors and just trying to create an RSS campaign based on that feed?
Hope that helps. If not, let me know!