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Nope.

"Romney's grandparents were polygamous Mormons who fled the United States with their children because of the federal government's opposition to polygamy.[1] His maternal grandfather was Helaman Pratt (1846–1909), who presided over the Mormon mission in Mexico City before moving to the state of Chihuahua and who was the son of original Mormon apostle Parley P. Pratt (1807–1857).[2][3] Romney's uncle Rey L. Pratt (1878–1931) would in the 1920s play a major role in the preservation and expansion of the Mormon presence in Mexico and in its introduction to South America.[4] Romney's parents were Gaskell Romney (1871–1955), who was not polygamous, and Anna Amelia Pratt; they married in 1895 in Mexico.[1][3] A more distant kinsman was George Romney (1734–1802), a noted portrait painter in Britain during the last quarter of the 18th century.[5]

George Wilcken Romney was thus born in Colonia Dublán, Galeana, in the Mexican state of Chihuahua – one of the Mormon colonies in Mexico – on July 8, 1907, to American parents.[1][6] George had three older brothers and would gain two more brothers and a sister.[7]

From your own post: George Wilcken Romney was thus born in Colonia Dublán, Galeana, in the Mexican state of Chihuahua – one of the Mormon colonies in Mexico – on July 8, 1907, to American parents.

He had American parents. That makes him a United States citizen by birth pursuant to the Naturalization Act of 1790. In fact, the Naturalization Act of 1790 states that a person born abroad to citizen parents "shall be considered as natural born citizens."