The owner better know about bitcoin, I have had talked with him for hours. He is an expert man in tech. I don't know if he own. He said he don't.
The whole cafe was designed with various cryptographic design, I guess it will make visitor learn about cryptocurrency. I am sure most of them ask what that means, why the design are like this etc. They will somehow know that there's something existed namely cryptocurrency, bitcoin.
It really doesn't matter if the owner knows about Bitcoin or actually owns Bitcoin though, because most of the customers don't know that. I think they should do a bit more to actually make the cafe an actual Bitcoin-affiliated cafe, not just a basic cafe with Bitcoin designs in it.