Having put fruit in a blender you are changing how it’ll get absorbed, because the blender did the breaking down versus your body. You probably changed how nature of the fiber in the fruit.
Also blending means no more chewing, aka less saliva to help breaking down things. Most blenders warm up the mix because yeah high speed, which means less vitamin as well. And there may be more aspects, I'm no nutritionist...
This is true. Also, when was the last time you sat down and ate five oranges? Processing changes what you eat. Oranges are pretty good for you, orange juice often is not.