I think his advice is garbage, but it doesn't trivialize depression at all. Depression is an umbrella term, he's speaking honestly about his own experience. It's still "depression".

There's always this sort of reaction anytime someone shares solutions, for severe depression or otherwise, casting it as patronizing and demanding more caveats and tip-toeing. You'd think they'd rather see wallowing in self-pity. In no instance are these meant to reflect personal failures.