The article makes great points. The most important one is that the carbohydrate content of Oatly is significantly greater than milk with a much higher GI sugar. It has a different sugar formulation which has double the impact (GI) on blood sugar as compared to Lactose (milk sugar). This alone makes it an extremely unhealthy choice as drinking 12 oz is certainly enough to spike blood insulin levels and cause a subsequent roller coaster effect on blood sugar.
People are blindly flocking it to it because sugar tastes good and clever but misleading marketing.
We really need better nutrition education in society and better marketing controls on sugar.