Yes they ARE Mormons. They are Fundamentalists MORMONS. Just as there are Shia and Sunni Moslems, there are fundamentalist and mainstream Mormons.
Get used to it dear, you are bound to see this often.
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These people ARE NOT members of the Church of Jesus Christ of Latter Day Saints (what you refer to as “Mormons”). Get a grip......
they are fLDS members of the Fundamentalist Church of Jesus Christ of Latter Day Saints....as in fundamentalist Mormons.
Get a grip on your own sweet self. :-)