I mean, sort of. Is the economy determined by one person? No. An entire administration, however, definitely has some sway. Interest rates, public projects, regulations (or lack of), so subsidies, those things all have an effect. It’s a very complex system with plenty of luck and unknowns that don’t change like a light switch just because a new guy was elected.

Still, look at the economies under Clinton, Obama, and Biden, then compare those to Bush, Bush, and Trump. That’s either quite the coincidence, or the person running the show does matter.