I just hope burger king won't change its mind later on because it's not the first international company to accept BTC only to reverse its decision later.
They don't have to change anything. You haven't read posts on the previous page. BK is not accepting Bitcoin. Everything is done by a third party site. It's like Amazon is not accepting bitcoin but you can buy a gift card with bitcoin and redeem it on amazon.
So, as far as I can tell, my post above is accurate: Burger King are not accepting bitcoin, but the service they use to provide home deliveries does (via Bitpay). It may be that Lieferservice have recently added the bitcoin logo to their landing page (hence the news story), but in reality they have accepted bitcoin for over 5 years already.