If you order the claims in the article on a scale of not racist at all to clearly racist, you'll see basically all of the corroboration comes from claims on the left side of that scale, and few if any on the right side. The claims I was specifically thinking about were things like:
> One Black employee said her manager suggested in front of colleagues that she was dealing drugs and carrying a gun, trading on racist stereotypes. Another said a co-worker at a recruiting meeting broadly described Black employees as less capable. Still another said managers spoke down to her and her Black colleagues, adding that they were passed over for promotions in favor of less experienced white employees. The accumulation of incidents, they said, led to the wave of departures.
These have no corroboration, even though they allegedly happened in front of multiple coworkers.
We don't need to corroborate each individual complaint. The story here isn't that one employee was passed over for a promotion. The story is the trend that all these anecdotes support. There is corroboration for the trend.
But the point is that the corroborations are all on the lesser or non-complaints of the article, not the most egregious ones. To make an extreme example, posting a series of actual facts that culminate in aliens have visited earth doesn't make the latter assertion any more true.
edit: Sorry, I'm the poster from above, I just posted from my phone which has a different account logged in that I originally intended to give hiring advice unlinked to my main account(opsec fail).
The egregious complaints are corroborated by the other egregious complaints.
Let's use another example in which evidence is hard to find: sexual assault. If one woman accused Bill Cosby of sexual assault, the burden of proof for her story is high. She would need some pretty strong evidence to get Cosby charged let alone convicted. She probably wouldn't even receive coverage in the mainstream media without some other form of evidence. However the entire situation would change if she was one of 60 women coming forward. Suddenly the burden of proof for that first woman is greatly diminished. Each individual's story is corroborated by someone else having a very similar story.
Well I guess some witnesses lied over three centuries ago so we can't trust any group of people anymore for the rest of history. It is a bummer how that worked out.
Interestingly, "carrying a gun" is an American stereotype here in Europe, not race-specific.
Isn't there like 400 million guns in private hands in the US? If so, the assumption that pretty much anyone you meet in the street might have concealed gun on them is not absurd per se.
But speaking about it aloud seems strange, yes.
"passed over for promotions"
This is the oldest workplace complaint ever and happens in racially homogeneous countries all the time. Favoritism in the workplace is probably as old as the pyramids.
> One Black employee said her manager suggested in front of colleagues that she was dealing drugs and carrying a gun, trading on racist stereotypes. Another said a co-worker at a recruiting meeting broadly described Black employees as less capable. Still another said managers spoke down to her and her Black colleagues, adding that they were passed over for promotions in favor of less experienced white employees. The accumulation of incidents, they said, led to the wave of departures.
These have no corroboration, even though they allegedly happened in front of multiple coworkers.