Yes, you're wrong there (no offense). He's quite popular beyond X (formerly Twitter), particularly amongst the young (~20s) conservative movements. For example, he has almost 4 million subscribers on YouTube and similar on TikTok.
I'd say X isn't even his most popular platform. He's much more popular on video platforms, due to his open campus debates.
I attended one of Charlie's debates this past year and they pretty much let anyone walk up to the mic. It wasn't scripted or censored, that I saw.