Earlier quoted context omitted.
Yes actually. If you believe that your management chain is ignoring you, in a public company you’re looking out for the shareholders by making a case for ineffective management. I’m not saying that’s happening here. But you asked for what purpose does making this public serve.
He doesn't work there any more, he doesn't have an obligation to the share holders and publicly trashing management is as likely to lower the share price as to raise it.
They have a right to express how they feel about the company. They don’t owe anyone niceness.