This thread is a little old, but I think this post from Roman is relevant. The video is titled “Sugar instead of rice.” He provides more context on digestion, and why he started replacing some of his traditional bodybuilding carbs (like rice) with more simple sugars.
“I’ll tell you quite honestly, when you east as many carbohydrates as I do (over 1,000g). Then it doesn't matter whether it comes from sugar, rice, fruit, or Haribo. Honestly, I could drink sugar water and it would have the same effect. It all ends up in the blood as glucose. The only difference is the strain on digestive system caused by the process required to digest rice. Instead of constantly increasing my rice portions, I am keeping them around the same and simply eating more sugar with each meal.”