Any "Twitter is a _ propaganda channel" seems a bit odd when you consider that users choose who to follow, who to block, what topics to follow, what keywords to mute, whether or not to see targeted ads, etc. Twitter might be able to do a better job of tackling outright misinformation that spreads on the platform and they aren't always perfect when it comes to banning or suspending accounts (or failing to do so), but in general it's hard to say that a platform is just a propaganda channel for a specific ideology when it is inhabited by a diverse range of incompatible ideologies. Users tend to sort themselves into bubbles of like-minded accounts, but that is on users rather than Twitter.