Do spherical lenses really fog less than cylindrical lenses?

Yes, but it's a physical advantage, not magic. The larger internal volume between dual spherical lenses creates a thicker thermal barrier that resists temperature equalization—the primary cause of condensation. This inherent advantage supplements whatever anti-fog coating and ventilation system the goggle employs. However, a poorly-fitting spherical goggle with blocked vents will still fog. Proper fit, unobstructed ventilation, and intact anti-fog coatings remain essential regardless of lens shape.