First off that page is literally titled "About the Topic of Race", clearly not ethnicity.
And why are you linking to an American census bureau if you want a real one? We all know America uses words differently to the rest of the world.
An ethnicity or ethnic group is a group of people that perceives to be different from out-groups based on shared attributes. These attributes include having a common language, culture, common sets of ancestry, traditions, society, religion, history, or social treatment.[
https://en.wikipedia.org/wiki/Ethnicity
Yes it is.
You're describing your friends genetics or ancestry being different to their ethnicity or culture. Asian or White are not ethnicities.
Ethnicity is not ancestry or "race". And yes I know Americans like to call different looking people ethnic.
An ethnicity or ethnic group is a group of people that perceives themselves to be different from other groups based on shared attributes. These attributes include having a common language, culture, common sets of ancestry, traditions, society, religion, history, or social treatment.[1][2] The term ethnicity is sometimes used interchangeably with the term nation, particularly in cases of ethnic nationalism. It is also used interchangeably with race.[3]
https://en.wikipedia.org/wiki/Ethnicity
You are that third minor sometimes used footnote, not the norm.
They largely are, ethnicity is culture (tradition, language, customs, beliefs) and history.
I do not relate culturally to the people where I live, I have far more in common in beliefs and values with the typical terminally online compared to people where I grew up. And I've been online since the Internet started, so I've got the history too.
I've been online all my life, I genuinely feel at home here. I relate more to random strangers across the world than any neighbors. Is it wrong for me to think of the (western/English) Internet as my culture?
We could probably print one with a 3d printer.