when I think of the word “fetish” I’m thinking about people who are into feet, bdsm, femdom, cuckolding or MDLB. Not someone who just finds X ethnicity more attractive on average than any other ethnicity. Nobody for example is going to say to a white man that he has a white girl fetish simply because he finds white women more attractive on average than any other ethnicity. Because it’s completely understandable that most people prefer to date with their own ethnicity. But the minute that white man finds a black women more attractive on average suddenly that’s fetishization. It’s completely ridiculous.
I don’t know if I’d be so quick to jump to racism for that. I think most people see an attractive person and think “damn, they’re hot”. If after a while they find themselves thinking this about a particular group more than others they’ll start thinking they have a thing for that group.
I think it’s creepy when people get super specific about the range of skin tone, nose, eye shape, hair texture, etc. that they like. When someone has a detailed list like that I find it objectifying, like they’re selecting options on a car (or sex doll).
Maybe the person in your example does have a thing for Namibian women. But unless they asked invasive questions about every striking woman they encounter I don’t think they’d ever realize it unless they’re from the region.
Add to that the specific example of someone from the U.S. where ancestry can be mixed and uncertain. The person from your example might think they’ve died and gone to heaven if they ever visit Namibia but walking around an American city I think they can forgiven for just thinking they like black women.