[eVeechu7]

I've got some home brand "100% wholegrain" oats here that say they contain 1g Sugars per 100g, less than half 1g per 40g shown in your table.

And even 1g per 40g is double 2g per 40g, not 'nutritionally identical'.

[thaumasiotes]

Do you have a point?

Here's Shredded Wheat: https://www.postshreddedwheat.com/products/the-original/

0g sugar per 60g serving size. Do I now conclude that you were trying to fool me into thinking oatmeal contains less sugar than cereal when in fact it contains much more?

No, that's nonsense, oatmeal is a kind of cereal. The amount of sugar in it isn't even related to whether it's oatmeal.