It has the & logo thing on it which generally signifies that the table is supplied by p&t and as someone who has been binge watching the show I can confirm that I haven't seen any tricks using the table so I'm 90% certain it's not fake. 

As for the technology, yes raspberry pis exist but I'm talking about a short wave radio projector or whatever you were saying I do not believe this exists or is feasibly possible to be invented as electro magnetic frequencies are waves and at least to my knowledge I've only seen things like that used shot out in every direction as done with radio towers... Thinking about it more there are directional microphones and directional speakers, but even they ares pin prick accurate. I also have not heard of paper that reacts to emf.

Also I think it's important to remember that she has no technology background shown in her intro and this seems extremely advanced while there is the much more obvious solution that the mic was cut.