I believed the article writer was 100% correct because Bitcoin was among the payment systems on the Burger king site and on
reddit people said the site accepted Bitcoin payment long ago before the news broke out.
The question is, why would they add Bitcoin logo to their site if they are not accepting it as payment?
that's big-ish news if correct
I imagine that with a franchise business operating model (that fast food corporations often use), the franchisee has alot of leeway to choose things like payment networks as a part of their contract with the parent company, so one can see how an association of franchisees from 1 country might get together and convince the parent company to do this through the (in this case) .de website.
the franchisees are actually real business owners, who can sell the "restaurant" (a bad description for BurgerKing IMO) to whoever wants to buy, so presumably they want to do the best they can out of their initial investment. Taking BTC might seem like a good way to do that, but we need more information about this story really