What it actually says is far less inflammatory:
"We have had repeated meetings of the extremism task force—it met again yesterday—setting out a whole series of steps that we will take to counter the extremist narrative, including by blocking online sites."
[1] This might not be true, but I feel that Englands intelligence capacity per capita is far greater than any other country in the world.
Automated systems get their block lists from investigations.
We can speculate all we want, but making up claims that are totally unsupported, and presenting them as actual statements made by a specific person in this way is pure character assassination.