Fares simplification was about creating 3
categories of ticket. In this case you have one fare (Anytime Day) in one of the categories (Anytime) and two fares in the Off Peak category (Off Peak Day and Super Off Peak Day) which is almost as simple as you can get*. If this was to be reduced to two types, this would only be achieved by abolishing the cheaper Super off Peak Day ticket.
Removing choice is bad for customers, as it results in passengers who would otherwise be able to purchase cheaper tickets being required to pay a higher price for flexibility they don't need.
* It can get simpler, there could be only one ticket type, Anytime Day (example) in which case there is no cheaper fare for travelling at particular times. Not a big problem on rural lines without a 'peak' flow, but this would be a major issue on, say, York-London and would cause me to never ever catch a train as I could not afford it.