It's very strange they say porridge oats are banned, then go on saying "natural porridge oats" are not.
In my mind porridge oats are natural and you don't have to say that. If you have something else you need to say so.
They are not banned. They are on "the list" (as the article says) meaning they must be scored using the "NPM model". Only scores exceeding 4 are "banned", which will include sweetened oats.
I’m assuming they mean stuff like Quaker oatmeal packets which are half sugar.