This figure refers to scientific tasks, at the moment there's no data about gaming performance.
The Zen 2 architecture will be released next year, it will power the Ryzen 3000 series. These chips will be made on a 7nm process.
Zen+ -> Zen2: +13% IPC (Average) in scientific tasks. Not bad.
— Bits And Chips - Eng (@BitsAndChipsEng) October 16, 2018
P.S. No gaming data, atm.