Peltier cooling or heating does require a fan. The peltier cell only moves heat from on side to the other side. Then, you still have to remove the heat somehow (heat doesn't simply dissapear) that's why most peltier setups have fans.

This is technically correct (the best kind of correct!) but in this specific example, this camera's Peltier has a fan on it.

The article specifically mentions that fans are used to disperse humidity and maintain the temperature difference.