I really don't think anyone is being silenced. Prominent gender-critical figures have large platforms and the media often relays their opinions. Gender critical people are speaking and been heard by and listened to by millions.
Scotland's GRC finally looks set to pass (it's been debated to death and has majority of public and politician support) but it's been delayed for years and given extra public consultations because of GC people speaking up against it, same with the UK's gender conversion therapy ban which is still on hold.
Just because the majority of the population don't agree with you doesn't mean you are "silenced", and just because a heckler was thrown out of a talk which wasn't even about the GC discussion doesn't mean you are "silenced" either.
"Frankly I don't want to find out what it's like to live in a country that hands politicians that kind of power"
Want to know what silenced actually means you have a lot of choices of countries to live in, try Afghanistan, China or N. Korea.