Terrible advice, lot of fruits are really high sugar and no they aren’t slow carbs at all, the opposite
Not all fruits are high carb. Plus many have great fiber which plays an important internal cleansing role.
I myself dont go for fruits, but go with veggies and some slow carb grain products. But there are some low sugar fruits that have great fiber for you along with great vitamins and minerals and antioxidants. And of course portioning is important and gnerally following the advice not to just eat carbs by themselves, but pairing them up with protein and fats.