LOL! this community is funny. Nope, they're not taking BTC. They're taking USD from Bitpay. Of course they're not actually gonna touch something like BTC, wouldn't make much business sense at all.
Kind of a silly thing to say. You could say the same thing about any payment method that isn't cash in the mail.
"They don't actually take Visa, they let a 3rd party handle it and take cash from the payment processor."
"They don't actually accept Euro, they have their bank convert it and take dollars."
Etc etc for literally any payment method.
What they do on their end is their business. People just want a choice in how to pay, and that isn't a bad thing.
You're ignoring a huge difference between real money and BTC. A business cannot risk actually touching BTC, as their banks would likely stop doing business with them. They also risk becoming a target of launderers, and thus risk criminal investigation. Besides the wild fluctuations in value that make BTC as a currency very dumb, the rampant criminal activity in this community assures that no business will touch BTC except through shady VC-funded ops like Bitpay.