and why hasn’t she fixed the economy from her completely ceremonial role

While that’s a bullshit accusation from him, it’d also be almost as much so if he had been talking about Biden. Presidents aren’t really what drive most economic changes, yet are regularly blamed for or credited with it by the public, and politicians regularly take advantage of that. What Vance is doing pretty par for the course. That isn’t to say that the practice of exploiting it isn’t disappointing, but it’s not like what he’s doing is all that unique.