on/off peak pricing only comes into effect for bookings made NEXT year. Until then, it's all standard pricing. Doesn't matter if the reservation is for June 2019.

"

• On August 18, standard redemption rates for hotel Categories 1-7 will go live. Peak, off-peak and Category 8 redemption rates will be introduced in early 2019."

So if you're planning to book for June 2019 - as long as you attach before January, there's no on/off peak pricing.