public static CustomObject__c updateCustomObject(CustomObject__c customObject) {
    if (CustomObject__c.getSObjectType().getDescribe().isUpdateable() == false) {
        throw new DmlException('No permissions to update.');
    }

    // This is fine with no PMD Error
    update resultObject;
    return resultObject;
}

public static List<CustomObject__c> updateCustomObjects(List<CustomObject__c> customObjects) {
    if (CustomObject__c.getSObjectType().getDescribe().isUpdateable() == false) {
        throw new DmlException('No permissions to update.');
    }

    // Getting PMD Error: Validate CRUD permission before SOQL/DML operation
    update resultObjects;
    return resultObjects;
}