Realistically, sweet things are fast acting carbs, and have a peak that occurs almost as soon as you eat them, but do not last long, so you probably would not see them on a meter taken at the usual 90 min/ 2 hr post prandial time. A CGM would probably show spike.
Where does the evidence come from that the eatwell plate - max 50% carbs max 35% total fat - is wrong? For normoglycaemics that is. American and Australian suggested proportions of macronutrients are similar.
There is no official evidence that it is bad for people and a good deal better than eating junk food except for the percentage of diabetics who say it is bad for them because it has to much starchy carbs. The way I eat is chicken or fish with plenty of vegetables no potatoes rice or pasta so that's the eatwell plate without the starchy carbs