Turns out it was speculation based on those screens(I hadn't really read them before, but on closer inspection it doesn't say we can buy the coins/nuts).
I was just going to say this...all it says is "Additional services based on user feedback".
They actually don't state you can buy the kupo nuts/coins for real money, just that you get an ADDITIONAL one per day with premium. So until we actually see the app, and if you can or cannot purchase them, it isn't guaranteed to be the case.