It is a flawed argument. Censorship may help democracy in the short term, but long term it effectively invites authoritarian rule. A good comparison may be forced ranking system. It can be used temporarily to 'get rid of dead wood', but long term use is asking for only biggest assholes to stick around.

Censorship is not that different. There is no nuance here. Person with power will determine what you can and cannot see. That kind of power does not allow for nuance.