Most White women aren't known for having amazing butts. Even with White women who most men would rate as Cute (6-7.9), the butt isn't a major factor in that. There will be cute range White women with decent butts, even attractive ones, but rarely amazing.
There's a reason for the acronym PAWG. PAWG = Phat Ass White Girl. That's a White female with a butt more typically seen on Hispanic/Latina women.
The OnlyFans woman we are talking about is a PAWG. She's also White and definitely not Italian-American. Italian-American would be the White women who would have the highest propensities to be PAWGs based upon the whole Meditteranean ancestral thing. That applies to more Southern Italian ancestry.