Twitter's been shadowbanning since 2018, courtesy of Vijaya Gadde's censorship regime.

How would you be able to know that your note (decrypted by their relay) is served to client applications other than your own? The decryption is the proof which is handled by their relay, not your client. They absolutely can serve the data because ypu are not calling the events from the source and decrypting them yourself. (And calling people gaslighters, deceitful, or cowards doesn't change that fact.)

True, being cagey about whether you censor people or not is definitely weird, fed-like behavior. Any normal business or community is upfront about what they want to exclude. Ironically it's very X. Musk was going super hard hyping up free speech maximalism, but it turned out some speech is much more free than some other speech in some very underhanded and sinister ways.