Internet Of Things / IoT / Connected Home / Smart Houses

That is not what the judge said.

It's how I read the article. Is the actual ruling available anywhere accessible?

A video doorbell that directly looks out onto a public space, viewable from the public street, this is fine as it isn't an invasion of privacy to observe a public area

My understanding is you need to put up warning notices with details of the data controller and respond to subject access requests. I've never seen such notices associated with householder cameras and in this case it sounds like they did not respond appropriately (perhaps to a deleting request).

You could argue the data controller is obvious on a house but plenty of blocks of flats have cameras, no notices and it isn't at all obvious who is responsible for them.