Censorship is a very real threat to scientific research but it tends to manifest as the state restricting research or pulling funding from politically unfavourable topics like climate change, as is seen in many American state governments and on a federal level under the previous administration. Scientific publication isn't exactly known for going through the channels of mass social media.
I talked about flow of information. Science isn’t done on twitter, and twitter is not for scientists or those able and willing to read papers. Twitter is for the 90% who rely on groups, and the more tooling we implement that incentivizes those groups to devalue intellectual depth, the more we restrict the flow of actual information at scale. Policing who is able to distribute which data is, simply put, harmful to the organism.
Improving signal quality != fire walling signals as a whole.
And that question is another one than "does twitter censor climate change-discussions?", right? My point was: yes, it does.