It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

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import crafttweaker.api.util.MCEquipmentSlotType;

MCEquipmentSlotType extends Enum<MCEquipmentSlotType>. That means all methods available in Enum<MCEquipmentSlotType> are also available in MCEquipmentSlotType

Return Type: boolean

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MCEquipmentSlotType.isArmor() as boolean
myMCEquipmentSlotType.isArmor();

Return Type: boolean

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MCEquipmentSlotType.isHand() as boolean
myMCEquipmentSlotType.isHand();