The content of your comment is particularly interesting, but in my humble opinion, the overall picture should be looked at!!
Anthropologists in Europe distinguished 5 main branches within the species Homo sapiens sapiens ( kaukazoid or europid, congoid or negroid, veddo-ausztralid, mongoloid, khoisan ) but these are also just collective names, because subvariants were created due to genetic mutations and subvariants also have smaller local forms. Such is evolution!
Within each subvariant, several skin-eye-hair pigmentations and different facial structures can be observed. Coupled with this is the psychological phenomenon that what is different can be attractive or repulsive, and by this we must understand both physical and spiritual differences!
A significant part of the American "white" population has ancestors from the western and northern parts of Europe , from the east, the ancestors of the Americans speaking Slavic languages. these people represent a phenotype within the Caucasoid race that is paired with light skin color and usually light hair and eye color ( east baltic, west baltic , atlantid, north atlantic, dali-falo ) . Skin color whitish-pink, the eye color is usually light blue, but sometimes green (in red-haired women this can be downright sexy!!), brown and gray as well, the face is convex, the nose is usually narrow, as is the mouth. The population of Southern Europe, the Middle East and the Central East (Portuguese, Basques, Greeks, Maltese, Corsicans, Turks, Armenians, Azeris, Persians, Tajiks, Bosnians, Croats, Arabs, Sephardic Jews,kurds.... etc.) have darker pigmentation, because they have a phenotype that was the anthropological characteristic of early farmers and was formed in the eastern part of the Mediterranean area roughly 12,000 years ago ( litorid, armenid, mediterran, dinarid ) . The skin and hair color here ranges from medium brown to dark brown to black, eye color is usually brown and black, the width of the mouth and nose is usually between narrow and thick, but medium wide is most common.
Representatives of the Armenian phenotype (Armenians, Kurds, Sephardic Jews, Assyrians) have the widest nose and mouth, and the body hair is also thick and dark. Among the members of the European ladies living in the north and west, many of them especially like to vacation in the countries of the Mediterranean region and do not really mind the very close acquaintance with Mediterranean men!!
The representatives of the "black" human main branch basically have medium or very brown skin pigmentation, brown eyes, and a wider nose and wider mouth give a more pronounced face than a combination of a narrower nose and mouth. Add to this some real-life urban legends and taboos about black men in the United States regarding their physique, penis size, and sexual stamina, and it's no surprise that some white and Asian women consider them to be more masculine than men of their own race!! This is essentially a "uniform" effect placed on sexuality!!
It's interesting that the study you read says that black women are not as attractive to non-black people as black men!!
For example, I find black ladies with a feminine full figure particularly attractive, who preferably have large breasts, but here in Hungary there are relatively few of them!!
It is quite possible that for many people, femininity is really equal to external and internal soft physical and mental features, Masculinity can be associated with physical robustness and a determined mentality in the subconscious of a certain proportion of the population!
As a result, for many, femininity is embodied by white and Asian women, while masculinity is more embodied by black and Mediterranean people.