The thing that makes X (Twitter) tricky for downloaders is not the encryption — there isn’t any, in the DRM sense — it’s the URL gymnastics. Tweet video lives at video.twimg.com behind an HLS manifest, but the URL on the page is a blob: reference that exists only in browser memory. The actual manifest is fetched by JavaScript at playback time, and its location is not visible in the rendered HTML. Anything that tries to scrape the tweet HTML and find a .mp4 URL will come up empty.
VidMost’s smart sniffer has an X-specific adapter that watches network traffic instead of parsing HTML, which is why it works on tweets that other tools fail on. The .m3u8 manifest is intercepted the moment the player requests it, every detected variant is listed in the right sidebar with a recommended best-match highlighted, and the built-in browser handles the sign-in step for gated content once. There is no separate workflow for “age-restricted tweets” or “verified-only video” — the user pastes the URL, the browser handles whatever wall X has put up, and the adapter captures the stream behind it. If a platform change ever outpaces the adapter, kernel record mode is the universal fallback: it draws a floating toolbar over the playing video and records while it plays, regardless of how the source is delivered. The one wall no mode can get around is a deleted tweet, because deletion removes the source entirely — that is a platform constraint, not a tool capability.