Nope. That’s a clearance sale (why, I don’t know) with only “12 left in stock.” Can’t compare a steep clearance discount to an iPhone X at full retail. Not with any validity, anyway.https://www.shop.bt.com/products/samsung-galaxy-s8-midnight-black-sm-g950fzkabtu-CTLR.html
Can be had slightly cheaper from other retailers also. Or for around £500 on Amazon.de if you’re happy with the EU version
Bottom line: it’s misleading to claim that an S8 is about half the price of an iPhone X. It isn’t.