The promotion is actually not buy one get one. They only put 2 food items + 2 lemonade drinks at one "cheaper" price, not buy one get 1 free at all. After the final price, it's like you only get free lemonade buy paying 2 full-priced food items. And you can't change the drinks for free, need to top up about $3 to $4 per drink.
Service was amazing. Smoothie bowl was super sweet, perhaps good for sweet tooth :)