This is a Prime Exclusive deal for Prime members only. In order to get this price, you need to add BOTH the 86" and the 43" TVs to cart. Discount should be automatically deducted when you proceed to checkout
https://www.amazon.com.au/gp/product/B0D16TZBRN
https://www.amazon.com.au/gp/product/B0D16SR2X6
Deal is buy the 86" Nanocell TV and get the 43" free. On top of that there is a 20% off discount applied which also includes the price of 43" TV even though it's free.
Not a great review https://www.rtings.com/tv/reviews/lg/nano81