Perhaps you meant "plurality ethnicities of the world," which is basically correct mathematically. A world with lots of ethnicities would be hard put to have two majority ethnicities. Wordage quibble aside, yes, I would expect analysis of workplace diversity in the United States to treat east Asian people and south Asian people (who in both groups in the United States are mostly recent immigrants, often but not always from families with fairly high levels of completed schooling and occupations with above-median salaries) as contributing to workplace diversity differently from other minority ethnic groups in the United States, as counted in official statistics, because those groups often include people from families who have historically been poor and with lower rates of completed schooling and lower salaries than the national average.
It would be unrealistic to expect workers in any one local workforce of a particular occupation to match exactly the overall national ethnic proportion (or even the overall national male:female ratio). Local distributions of people by ethnicity are not the same as the national distribution, in almost every locality, and preferences for pursuing various occupations are not culturally the same across all ethnic groups. But socially perceived ethnicity also influences personal opportunities,[1] so smart employers go out of their way to look for talented people who have something to contribute not just in the usual places, but in all the places the employers' desire to hire talented people can be communicated.
That link you provide is an awful lot of anecdotes and ascribes a lot of things to 'stereotypes'. In other words, while the reasons for the different experiences he relates could have been myriad, he always ascribes them to a (positive?) stereotype.
If that's how I'm going to analyze my life, I had better be well prepared for weird things. It's silly to view my life trough the lens of stereotypes. Why did my parents not send me to private school? Stereotype. Why did that person turn me down for a date? Stereotype. Why was I encouraged to do X? Stereotype.
It would be unrealistic to expect workers in any one local workforce of a particular occupation to match exactly the overall national ethnic proportion (or even the overall national male:female ratio). Local distributions of people by ethnicity are not the same as the national distribution, in almost every locality, and preferences for pursuing various occupations are not culturally the same across all ethnic groups. But socially perceived ethnicity also influences personal opportunities,[1] so smart employers go out of their way to look for talented people who have something to contribute not just in the usual places, but in all the places the employers' desire to hire talented people can be communicated.
[1] http://pgbovine.net/tech-privilege.htm