“I will not be slienced.” (Greta Thunberg in Bristol)
How would she know? Indeed, how would we know? It savours less of English understatement that of pointed irony to say that noone has tried to silence her. So it seems to me that we and she lack data on this point.
Greta has Asbergers Syndrome. Fans of ‘The Big Bang Theory’ know how many of the jokes depend on the impossibility of silencing the asbergian Sheldon by the gentle methods of social cues and hints, and the ease of doing so when to speak or to act requires that he move outside his idiosyncratic comfort zone. If Greta ever goes to China (obviously required by her proclaimed cause but AFAIK not even hinted at by her handlers or herself) then we may learn how far her ability not to be silenced extends beyond her condition. Meanwhile, we are entitled to reply to her, “How do you know?”
The question could also be put to her about other matters.