I'm building the site (but I didn't submit this Show HN).
The private part of the shares are clearly marked as private in details, and there's an explainer eg at [1].
I do think it's important to include private equity in packages. My Uber stock package turned out to be worth a lot of money once the company went public. I now have friends at Databricks with massive packages - which can go up or down, and are dependent on an IPO. But this is very important information in my view.