It does state 98, however it also states 95 can be used with no detriment to engine durability or driveability.
I've used VPower, Momentum and normal unleaded over the past 18months and never noticed an increase in performance (daily driving) or mpg when using premium unleaded.
My friend has a Porsche and he says he can't run it on anything less than 98, personally I think you should do what's makes you comfortable and in my case I'm comfortable using 95 unleaded 👍