What are you talking about?
If unlike Heller and MacDonald the Supreme Court actually enforces this decision in less than a dozen year, soon more than 60,000 people will be able to own and carry concealed handguns in NYC, and more than the typical 1-2 in San Francisco. As is currently true in 43 states, 24 without a license and another on the beginning of next year.
Not defending his position or agreeing/disagreeing with him, just explaining what I believe most likely happened in that comment chain.