That, I agree with. But the article is advocating for much more.

Unfortunately, there is a fundamental problem with sharing market cap and number of outstanding shares with all employees (and prospective ones). This data would quickly leak to the competition and other unwanted hands.

Ok, then as an employee I must value your stock compensation at 0.

That's not what I meant. The company can (and should) share the share price with you as a new joiner. That helps you value the stock compensation.