"What if a small news website had a post about how the Tory government is failing the NHS?"
It's taken five years of negotiation for this to happen. I think that will give us time to spot the Tories trying. Or even, possibly, vote them out.
(And if they really did delist a story---or, more plausibly, delisted a site promoting stories injurious to the music industry---the delistee could still publicise themselves on social media or forward their stories to the mainstream media, as well as creating a story our of the delisting which would certainly be of interest to sites like El Reg.)
The questions we should be asking are things like "Who decides its a pirate site?" and "Is there an appeals process to handle mistakes?"