If it is similar to the Fim E Bike Enduro World Cup, they mean only bicycles like this
The 2019 FIM E-Bike Enduro World Cup will include two categories:
• Enduro1 (E1): E-Bike equipped with a motor with a maximum rated continuous power of more than 250W and whose assistance can exceed 25 km/h without exceeding 45 km/h. Minimum age of riders - 15 years old.
• Enduro2 (E2): E-Bike equipped with a motor with a maximum continuous rated power of 250W and whose assistance does not exceed 25 km/h. Minimum age of riders - 14 years old.