Terminal velocity is defined as the velocity at which the force of gravity is equal and opposite the drag exerted by the atmosphere. So, yes, I think Starship i

Terminal velocity is defined as the velocity at which the force of gravity is equal and opposite the drag exerted by the atmosphere. So, yes, I think Starship is hitting terminal velocity at 10 km, but the velocity is smaller than the terminal velocity at 100 km. Less atmospheric drag at 100 km means the velocity is greater than at 10 km, so 100 km flight would be different than a 10 km flight.