Well, it isn’t. You can’t take a problem that is universal to all workers in all industries as evidence that one demographic in one industry is discriminated against.
And, it is easy to generalise: Workers on one side, bosses on the other.
Focusing on tech is fine, but claiming there's a unique problem of demoralization, underappreciation, shit management etc. to only "marginalized people" is what makes this article highly questionable.
All that "toxicity" applies just as well to white males in tech.