Not sure if you know this, but you can ask Google to blur a Street View address by filling out a form. I'd guess he did this himself versus any sort of conspiracy thing happening.
I gave it a shot and couldn't find the form. Before I got anywhere near it, Google Help seemed to suggest that the address to be blurred needed to be a violation of Google's policies or something.
Whatever the reason, makes me wonder why would anyone try to do this. I mean, I know where it is - I can drive there and take a picture if I wanted to. But bluring out one particular house on a normal street is kind of like the story (I believe from one of the Sherlock Holmes books) about a guard telling the detective about all of the town, apart from one house, where he hid the body.
You have to show yourself, and this increases the chance of people reporting a strange man taking photos of a house.
Yes, it's not cryptographic-level security, but it raises the costs of an attack. In the real world, that matters.
Also consider that not all attacks are spy-vs-spy. This could be a case of 'keeping honest people honest', i.e.: making it sufficiently difficult to dissuade the majority of political activists and/or protesters. This is the same reason why padlocks are a thing.
> You have to show yourself, and this increases the chance of people reporting a strange man taking photos of a house.
In the year of pokemon go players everywhere? And even then, who cares about a person with a mobile phone? We're a good decade after anyone is a "strange man" when taking photos anywhere. You don't even have to show yourself. Just order a cab and go through that street without stopping.
> dissuade the majority of political activists and/or protesters
I'm not convinced. The only thing the blurring did was prove that this is the interesting house, rather than a name coincidence. What is that supposed to dissuade me from if I was already going to go there and do something potentially illegal?