The example given was of a man in a “Plasticine Action” t-shirt, with the poster saying how that man was “disappeared” by the British state when he was briefly arrested and released.
If you’re not aware of the history of people being disappeared by states such as Chile under Pinochet, or more broadly what it means for a state to disappear someone, that’s kinda on you.
Either way these are not equivalent actions.
Yes, it’s suppression of free speech in a chilling manner. I hate it. No, it’s not the same as suppressing that speech by taking someone and holding them in a secret prison for years and/or killing them.