Nonsense. Fruit has fiber and all sorts of nutrient benefits. Even your smoothie claim is false: https://www.stylist.co.uk/fitness-health/nutrition/smoothies...

Generally, whole fruits are considered to have positive health effects, even in studies of patients with diabetes, at nearly any quantities.

https://youtu.be/bHnsawfk43Y

It's important to differentiate between the types of sugars and the overall nutritional value of fruits compared to other sugary foods