There's a freudian slip in that press release. It says:
But if they make 4 zone 1 tube journeys in a day they will see a 20p rise as the daily cap has incresed.By keeping some fares - including Tube, DLR and rail fares set by TfL within a single fare zone – at the same level it will support the wider economic recovery of London, including tourism, as those visiting the capital and travelling exclusively within Zone 1 will not see any fare rises.