Are these Ruthenian Byzantines?
Don't know ... check their web site.
I don't read it that way. They have their own eparchies.
This is an article listing the various Rites that came up on Google (post-worthy?):
http://www.crisismagazine.com/feature1.htm
Interesting blurb (must be written by a Latin, I doubt any Orthodox Freepers would say being 'fearful' of losing their traditions is a big motivation for them.):
With a few exceptions, the Eastern Catholic Churches result from incomplete reunions with the Orthodox Churches. In those instances, large numbers of bishops and faithful of the Orthodox mother Churches either held back or later rejected union with Rome. Today, many Orthodox are fearful of losing their distinct traditions in a world dominated by the Latin Church. Making matters worse, some of the Eastern Catholic Churches have adopted Latin customs and haven’t been very good examples of how union with Rome should work. This is tragic, since the traditions of these Churches are themselves apostolic and help preserve the catholicity of the Church with their own unique development of the gospel message.