I honestly don't get what the fuss is about.
"The Uncanny Valley" is simply a handy way of refering to a specific phenomenon. The situation it describes is real - or at least the basic facets of it are. Certain kinds of human-looking objects invoke certain kinds of "creep-out" effects in certain people. Referring to that response as "The Uncanny Valley" seems entirely reasonable as just a useable label.
Mori wasn't a scientist performing research on human behavior - he was a roboticist describing an effect that he had seen in action. People were, and still are, creeped out by certain human-like things, and he, as a roboticist, came into direct contact with that human response. It wasn't hypothetical - he had people telling him things like "That's creepy!" in regards to human-like robots. So it's not at all shocking that his explanations of the phenomenon are not scientifically accurate or comprehensive - he never intended for them to be!
Moreover, the BBC article is absolute rubbish. It cites the Hanson study, then immediately points out that this particular study has been criticized. So a single study that they admit is almost certainly flawed is grounds for a misleading headline about how "The Uncanny Valley" might not even exist? Talk about your senseless invent-a-controversy journalism!
The rest of the article talks about how other studies have had difficulty "mapping" the effect, feebly attempting to use that to prop up the article's earlier suppositions. Honestly? They're seriously suggesting that the fact that science hasn't yet been able to properly measure the phenomenon in easily understandable ways means the effect itself may not actually exist? Rather than the possiblity that - just maybe! - it's just one of those weird facets of our own immensely complicated human nature that is beyond our understanding for the time being?
Absolute rubbish. The BBC should be ashamed for putting out that article, and BoingBoing should be ashamed for championing it.