He is going to doom and gloom any situation that results in him potentially losing money. And him losing out on profit to pay his staff probably doesn't enter his mind. If he made $X of profit last year, he wants to make $X+ this year. So he figures if he has to pay people Y more, he will have to charge Y more so he can still profit what he wants to.
To your opinion on what he should do regarding "extra" employees, I'm going to refer you to the book, Slack. While those employees are technically standing around being extra, they're needed to accommodate the bursts of activity that happens in a restaurant. Restaurants aren't busy all day long, they're busy in spurts. When you need people, you need them now.
And I think that may a major issue. The tipped minimum wage makes things feel like they're running efficiently, when it's really just shifting the money around in a way that is not optimal for the customer and causes them to overpay.