It depends.

One of the problems with many radiators is that they heat a relatively small amount of air to a high temperature. Hot air then rises. This creates a warm layer up a ceiling height but leaves it cooler at lower levels. By using forced airflow, you can heat a larger amount of air to a lower temperature. This results in a more even distribution of heat.

This is also why ceiling fans can help in the winter. They can stir the hot air back down into the rest of the room.

The only flaw I can see here is the fan’s direction. It’s pushing hot air up. A radiator cover that redirects it sideways would make a significant difference.