It's naive to expect all strata of society to change with immigration without any lag. The US was 83% white as recently as 1980, which could be the population that has had time to climb up to leadership roles - something that can easily take a generation or two, especially when education is so expensive. In 2017, it was down to 73% white (61% if limited to non-Hispanic, but the older data doesn't make that distinction, making comparison difficult) [1].

83% / 73% = 1.14, while the "heavy" over-representation the article mentions is, estimating from the graph, about 1.17. I.e. if comparing to 1980 demographics, whites are over-represented in tech leadership by a whole 3%.

But more puzzling is this statement: Not only are employees of color under-represented in leadership positions in tech, they are also under-represented in tech in non-leadership positions.

The graph immediately following shows whites are under-represented in tech - "heavily" under-represented, if we were to use the author's own metric (the author chooses not to mention this). So both whites and people of color are under-represented?? Of course that same graph contains the answer - Asians are over-represented by 483%. 17% over-representation was "heavy", so the author was unable to find a sufficiently strong adjective for 483%, and wisely chose not to mention it at all.

[1] https://en.wikipedia.org/wiki/Demographics_of_the_United_Sta...