if you don't quite understand what a transistor is, or how code works, or how a large language model turns inputs into outputs, then "well there must be a little dude in there somewhere" makes as much sense as anything.
In all fairness, this is how people come to believe in a consciousness too.
It's especially funny because they do tours without having to book in advance too. It's a cool building, and I would recommend that people have a look around if they're in the area.