IIRC, the UK has a sort of TV tax (which I don't know the full details of), and I assume Japan has something similar, meaning they'd have to verify if he actually has a TV or not.
Honestly, it'd be better to ask someone who knows about this shit, but looking at the Wikipedia article on NHK: https://en.wikipedia.org/wiki/NHK
It looks like any equipment that can receive an NHK broadcast (such as a TV) requires a standard fee, so yeah, a kind of TV tax.