It took me quite a while to "get" the "Arby's" restaurant name.
I used to eat there occasionally because it was cheapish many, many years ago.
It's just deli meat. Arby's is extremely open that their roast beef is deli meat roast beef. It's no different from what you find at the deli counter in your local krogers.
Have you or your friend never seen deli meat before?
Have you never seen a company lie about something?
Good lord.
How is anyone ever confused by this? Are you confused people eat taco bell? Are you confused by a cheese steak sandwich?