No, this page will not give me the answer. There are posts from DXO staff stating that the WCL-100 II is supported with the earlier x100 models, but the tool that you provided a link to doesn’t list it. So in the case of a converter, it may not be listed. Here is the post I’m referring to:
I’m assuming that since pureraw supports the converter for the earlier models, it will work for the x100vi too, but I was hoping to get confirmation.