This is more true than false.
A 6'0" - 6'4", white, muscular guy or fit guy is going to have the widest market. This guy can get nearly any White woman. A lot of Hispanic and Asian women will be interested.
One of my good friends is a 6'4" white male. Now that he's been in an LTR for 5+ years, he is not in great shape now. However, prior to that LTR resulting in marriage, he was in good shape. He is also a former NCAA athlete in a country club sport. He's a basic white male from middle America with no distinct ethnicity. There are ethnic looking white males as a side note. If you looked at his segmentation profile, he would be the dreamboat of every basic college educated white woman in her 20s, which is was he was pursuing in the 2010s while single. I agree that he would not have been as successful if he had been targeting Hispanic or Black women.
Some men don't have an obvious segment.
I'd say that I'm one of those men that don't have a killer segment that goes wild over me, yet I have put up a solid lifetime notch count. While I don't think I have a segment that will be immensely attracted to me, I also don't have too many segments that vomit at my existence. I'm 5'10", medium build, and have Italian-American ancestry with a Southern Italian look. Because I said I'm Italian-American, one might think that guidettes might be a good match for me. I don't live in an area with a lot of guidettes, so that's not a viable segment. Also, guidettes tend to go for more muscular men than myself. I can go for Hispanic women with my dark, almost Hispanic like features. Hispanic women won't go wild for me but they're not opposed to me. I have had sex with Hispanic women. I'm kinda ethnic for the basic white woman, which can go either way. Some basic white women felt that my look was exotic and they were turned on by having sex with me but staying within the White race. Some basic white women might prefer a more cookie cutter guy and I'm not that at all. I'm good at some sports, but some of the women who are good at many sports like I am are taller women (5'7" - 6'1") and looking for taller men, though I can get some of these women.
Due to the fact that I don't have an obvious segment or a good social circle, I have put up with a lot of aggravation to achieve what I've achieved. I have had to deal with a lot of shiit with websites back in the day and swipe apps in more recent years. I have done a lot of cold approaching, which is a tougher path than making it happen through social circle.