To be fair, Seatguru does say in the text that the divider is movable, and if you click on the middle CE seats it explains that it can also be a ET seat - although why it only points that out for the B seats and not the E seats is a mystery.
This A320 features a two class configuration with between 12-48 Club Europe seats and 96-150 Euro Traveller seats.
The Club Europe seats are standard Euro Traveller seats with the middle seat blocked off. This plane has a movable divider between the Club Europe and Euro Traveller sections, so many configurations are possible.