There's a data mismatch between the CB blog post and the article. CB cites that only 2-3 formal complaints were filed iirc.
11 employee complaints matches pretty closely with the PDX group.
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FWIW I'm not dismissing the complaints. I've worked and studied in places where I've felt like an outsider; I've seen people make inappropriate comments about race+stereotypes in past work environments; I've also seen people make fishing claims of racial discrimination.
I wasn't on those teams in 2019, so the truth is I simply don't know.
From what I see today and the lack of concrete evidence in the article, I do have some doubts about the overall impression the article tries to give. I have the sense that certain information might have been omitted that might paint a clearer picture. I could totally be wrong as well.