I don’t know… the bottle clearly says “Skinny Syrups” and “Vanilla Almond”, and even has a cup of coffee on the front. If 3rd graders (9 year olds) are making a jump to assuming that it’s liquor, it’s got to be purely based on color and style of the bottle, implying a fair bit of familiarity with booze bottles- specifically enough to think that pale amber syrup must have been beer.
I’d have thought one kid would have caught on after reading the label, but I guess not.