Wish I could find a more neutral source, but this is what is available. I was surprised to see this, I had thought that shadowbans on twitter were like those on reddit, so only used for non-human bots.
Shadowbans only work against annoying humans that don’t pay attention.
https://twitter.com/search?q=Giorgia+Meloni+filter%3Avideos&...
The article is referring to the former (as can be seen from the screenshot).
And the results seem to be changing - when before I got zero results for the video tab search, I now get exactly one - a video posted 3 hours ago.