I would guess that this happens more often than you imagine. Women often don't share stories like this for fear of retribution at their current company or future companies, or because they think you won't believe them. In addition NDA's are often a condition of receiving severance.

Most women in Silicon Valley have had experiences similar to those mentioned in the article (HR disbelief, multiple women reporting same man to no effect, retaliation, legal threats, &c, &c).

The OP probably declined a severance package to write this.