That's a very elaborate scheme. I thought they would just have the arcade room in the basement below the miners and then use something cheap and obsolete like Antminer S9's for the mining which would be.

That would fool the police and inspectors but not anybody with an inkling of crypto knowledge

It's a very high-tech implementation but I guess I shouldn't be surprised, it's literally South Korea. There's tech everywhere. (at least in Seoul.)